Decision to move capital to Maragha for Mongol Empire (Genghis Khan)

[Failtier]

I am currently using the Buffed Mongol Invasion Mod and on the long run, I find it a bit too powerful, especially the buffed movement speed of Mongol troops (+50%) which is due to their capital being in the Eastern corner of the map.

To circumvent this, I want to create a mini mod allowing the Mongols to move their capital to Maragha as soon as they have conquered it.

Does anyone know how to implement a mod like this? What I want to do is that as soon as they have conquered Maragha, Genghis Khan will take the decision to move their capital to Maragha in order to have their troops raised there instead of Karakorum which takes AGES for them to conquer the Western parts of the map.

Generally, it would be good if the Mongols could move their capital step by step the more they move West but that's imo something Paradox should take a look at.

*edit*

I based my code on James Beaumont's code to Establish the Yamagate in Samarkand, and at least the AI took the decision to move to Samarkand. Not sure if it also works for Maragha. If you are interested, this is the code. Have fun!

###################
# Move Realm Capital to Samarkand for Mongol Empire
###################
set_capital_samarkand_decision = {
    picture = "gfx/interface/illustrations/decisions/decision_destiny_goal.dds"

    desc = set_capital_samarkand_decision_desc
    selection_tooltip = set_capital_samarkand_decision_tooltip
    major = yes

    ai_check_interval = 12

    is_shown = {
        is_ruler = yes
        is_landed = yes
        has_title = title:e_mongol_empire

        NOT = { capital_county = { this = title:c_samarkand } }
        NOT = { capital_county = { this = title:c_maragha } }
        NOT = { has_character_flag = flag_already_given_samarkand_once }
        NOT = { has_character_flag = flag_already_given_maragha_once }
    }

    is_valid_showing_failures_only = {
        is_capable_adult = yes
        is_imprisoned = no
        is_independent_ruler = yes
        highest_held_title_tier > 3 #Only Kings and Emperors
        custom_tooltip = {
            text = samarkand_held_by_you_or_vassal_tt
            OR = {
                title:c_samarkand.holder = {    
                    any_liege_or_above = { this = root }
                }
                title:c_samarkand.holder = { this = root }
            }
        }
    }

    effect = {
        add_character_flag = flag_already_given_samarkand_once
        create_title_and_vassal_change = {
            type = returned
            save_scope_as = change
            add_claim_on_loss = no
        }
        title:c_samarkand = {
            change_title_holder = {
                holder = title:e_mongol_empire.holder
                change = scope:change
            }
        }

        resolve_title_and_vassal_change = scope:change

        title:e_mongol_empire.holder = {
            set_realm_capital = title:c_samarkand
            add_opinion = {
                target = prev
                modifier = established_samarkand_opinion
            }
        }
    }
   
    ai_potential = {
        has_title = title:e_mongol_empire
    }

    ai_will_do = { #Do it always, for coherence.
        base = 100
        modifier = {
            factor = 0
            title:c_samarkand.holder = {
                OR = {
                    is_ai = no
                    any_liege_or_above = { is_ai = no }  # AI will never take provinces away from a player.
                }
            }
        }
    }
}

###################
# Move Realm Capital to Maragha for Mongol Empire
###################
set_capital_maragha_decision = {
    picture = "gfx/interface/illustrations/decisions/decision_destiny_goal.dds"

    desc = set_capital_maragha_decision_desc
    selection_tooltip = set_capital_maragha_decision_tooltip
    major = yes

    ai_check_interval = 12

    is_shown = {
        is_ruler = yes
        is_landed = yes
        has_title = title:e_mongol_empire

        NOT = { capital_county = { this = title:c_maragha } }
        NOT = { has_character_flag = flag_already_given_maragha_once }
    }

    is_valid_showing_failures_only = {
        is_capable_adult = yes
        is_imprisoned = no
        is_independent_ruler = yes
        highest_held_title_tier > 3 #Only Kings and Emperors
        custom_tooltip = {
            text = maragha_held_by_you_or_vassal_tt
            OR = {
                title:c_maragha.holder = {    
                    any_liege_or_above = { this = root }
                }
                title:c_maragha.holder = { this = root }
            }
        }
    }

    effect = {
        add_character_flag = flag_already_given_maragha_once
        create_title_and_vassal_change = {
            type = returned
            save_scope_as = change
            add_claim_on_loss = no
        }
        title:c_maragha = {
            change_title_holder = {
                holder = title:e_mongol_empire.holder
                change = scope:change
            }
        }

        resolve_title_and_vassal_change = scope:change

        title:e_mongol_empire.holder = {
            set_realm_capital = title:c_maragha
            add_opinion = {
                target = prev
                modifier = established_maragha_opinion
            }
        }
    }
   
    ai_potential = {
        has_title = title:e_mongol_empire
    }

    ai_will_do = { #Do it always, for coherence.
        base = 100
        modifier = {
            factor = 0
            title:c_maragha.holder = {
                OR = {
                    is_ai = no
                    any_liege_or_above = { is_ai = no }  # AI will never take provinces away from a player.
                }
            }
        }
    }
}