I don't think Izu knows, actually I think no one who shares gacha headmods knows, usually it’s just a raw import with some edits to make it look good, but the people who make headmods that interact with the rest of the game are actually very
very few.
One example of a creator who is able to do that, I think is Sunimo, but he is selling that knowledge, and although I think that is much better than selling cards, I doubt you would be willing to pay 60 dollars for an online class.
So yeah, I think this is simply not something easy to do.