I'm in. Where do I put the money?
It would probably die out soon. XEmacs is one of the longest living Emacs forks and even that is dead(ish).
Still, I'd put up some money for this.
(This post was written inside EXWM ;-)
Is this something we care about? RMS doesn't own lisp-based text editors.
[1] Not without reason since his foresight has been correct wrt privacy, civil rights, etc.