Given the fact that the movesets exist on all of the versions of the game and what is missing would just be the character models, weapon models, and voice samples... I think the former could be done if you know how.
The one thing that everyone that runs backups needs to figure out is how to make a cert patcher program that patches certs using a game that the person that wants to install the game owns (like a free game such as Shuffle, Shelter, or a demo.) Then people can finally get online like they did on 3ds.
Ya know why I would want to decompile a kip1 file, lad? WELL, IT'S BECAUSE IT ORDER TO CRACK SX OS YOU NEED TO GO INTO loader.kip1 AND CHANGE THE PARTS WHERE IT SCANS FOR THE license.bat !