Mod requests (orders).

Could you create a mod for me so that, instead of Twilight Witches/Shadow Lords/Mistresses of the Night, the Dark Elves can recruit Manticores? I've tried several times, but it doesn't work. I seem to be doing everything correctly and have created the upgrades, but only Manticores (without upgrades) can be recruited in the castles, and the upgrade slots are just empty squares. Or at least, could you tell me how to do it? I would be very grateful!