I might be mistaken, but you could try to replace other characters with the alloy files from their pf/figher/ folder. Just change the names of the files to what they would be for the fighter your replacing. Though, the only problem is the fact that they don't have a final smash file of their own, which could cause problems. Since your using Project M, you could try to pair it together with BrawlEx and add the alloys in as extra slots to keep all the other fighters intact. I haven't tried this myself yet, but there is a good possiblity that it could work. Here's a link that talks about merging the two mods together:
http://forums.kc-mm.com/index.php?topic=66871.120And here is the link to BrawlEx main page:
http://forums.kc-mm.com/index.php?topic=65113.0There is some nice tutorial videos that explain how to set up BrawlEx there too. Let us know how this goes for you. Also, your post should have been placed in the help section and not in the general discussion board. Might have had others reply back quicker if you did.