Only other option I can think of is if there is some way to edit the custom songs where I can change the origin and not lose all the camera edits.
MiloMod might help you with that one. That would be a lot of work though, to do your entire collection.
You are about to leave Rhythm Gaming World and access the external songs DB. While no song or file sold for commercially available videogames is hosted there and only fan generated content is allowed, Rhythm Gaming World has no direct control over the database and no files are hosted here. Alright, we had to made you aware of this, now you can visit the database!