Okay, this is going to be alot to ask, but could airplanes be made moddable? Maybe taking them from HOI4 or give a modifier for units that allows them to "walk" on water.
This is no experienced scripting but it it could be something like this:
CAN_WALK_ON_WATER = yes
Or
WALKABLE_TERRAIN_TYPES = {
water
desert
....
}
This is no experienced scripting but it it could be something like this:
CAN_WALK_ON_WATER = yes
Or
WALKABLE_TERRAIN_TYPES = {
water
desert
....
}