not gonna happen
they are only able to import models over mario right now (some people have even imported models for
and
but those are just 4 models i think so that's also not going to happen)
Zankyou can import over any character, he just hasn't published any tools for other characters afaik.
He did however post skeletons for other characters. So export a character from smashforge, make your desired edits and then resize it accordingly to the skeleton zankyou uploaded so it's 1:1. Then he might just be kind enough to import it back into the game for you.
Achilles did stages a long time ago, so it's possible he knows by now how to import weighted models, but I don't really follow the modding scene anymore so idk.