Not totally useless. The charts can be ported to Pinky. You just have to replace existing charts with the preload charts, rename the files and then edit the info in music_data.bin (extract bin to json with musicdata_tool.py, edit, convert back to bin). You can't play them while connected to a server but you can still play them. You could probably just add completely new entries for them to omnimix tbh I think you just have to make sure there are no conflicting song ID's.