SP - General Culture/troops recruitment converting for settlements conquered by other faction

[Kochobo]

This was in native or mod in Warband.

When a settlement (town, village) was conquered by other faction, after a while, (also being able for the owner to invest money on culture conversion), recruited troops were converted into the new faction's troops ones.

This, combined to being able to create your own custom troops with your own kingdom, would be nice.