assasinate the king/heirs to eliminate them and bribing is a good way to get good units for cheap.

so is using crusades or jihads to sponge up troops.

too bad that the unique troops wouldn't be much use if you only end up with 1 man szekely units etc like I always do.

I can rarely get more than single digits in a single unit in a crusade once it's over.

combining would partially alleviate the problem though.

modding them in would be unbalancing and you might also forget to change it.