Units requiring multiple buildings?

I want to make several units require two buildings, for example Temple AND barracks. If only one of them is built, the unit shouldn't be possible to recruit. If you conquer a settlement and the barracks are constructed, for instance, you should only need to construct the temple and everything should work, so the barracks shouldn't require the temple building. Just the unit that should require both. Is that at all possible? I haven't succeeded yet. If it would be possible, it would open many paths for modding.

Have a look through this thread:

https://forums.totalwar.org/vb/showthread.php?t=39925

Thanks a lot, now things will get interesting :)