Is there any way to reverese only external vassal wars as Byzantine Count?

[Castios]

Basically liege of my liege, Byzantine Emperor enforced external-only vassal wars. My knowledge tells me there is no way to reverse it by myself but maybe I am just missing something? Feels so frustrating having your hands tied.

Do I basically have to wait and hope for the best?

 

[Starcomet]

If you desire to go to war with your liege for his title it will be difficult. You will have to plot, faction, or marry into their dynasty.

 

[Telenil]

"Increase Council Power" factions. They also decrease the Allow/External laws when successful. Never done it myself but that's what some patch notes said a while ago.