I'm not sure I see the *need* for collaborators to be on the same DAW. Citizen Regen has two members recording in Studio One, one in CbB, one in Ableton, and one in Reaper (he used to use Digital Performer).
It's never hindered us. Why? All members transfer full length 24/48 wav/flac files. We don't need DAW specific project/song files to get the collab done.