It is unfortunately unlikely for me to try something like that, as I always try to make sure the Dolmexica mods I make also run on the Dreamcast. And in my experience, anything from 3D games and from after the Dreamcast's lifespan does not fit in the Dreamcast's limited memory.
I am still fixing Dolmexica so it works with the Street Fighter VS Tekken mod, and the characters there seem to fit into Vita memory at first glance. Maybe someone has already made Street Fighter IV / Tekken mods for Mugen? If those don't work with Dolmexica, I would also take a look at those, but I wouldn't proactively make new ones.