The only way I could think of would be to port either the animations or the Spiderman model over the other character, as you can't just change names for it to work.(I Tried it, it failed.) You can always request for the same Zelda PSA put over Sheik, or a request to port Spiderman from Sheik to Zelda, using the proper boards.(Model Requests and/or A/A Requests/Ideas)
ok so I would move stuff over...its so wierd tho because FitShiek.pac literally has NOTHING in it. it has like 2 data files both of which say null