That's the tricky part - they use a 3rd party to manage the moonlight magic registration (hence why it always works

), and they only capture the member's name and party size, so it'd be impossible to correlate that back to the
MDE accounts.
In the past, they've given out paper tickets upon entry with a return time window similar to an old-school fastpass. They did that for the Safari at Animal Kingdom moonlight magic last time I attended that event. My guess is they'll do something like that for Cosmic Rewind (if capacity controls are even necessary at all, which isn't for sure. )