There’s also the opposite idea that the First Order was sent to kill them all by Jannah and her company. Probably at the direct command of General Pryde, because he was a part of the original Empire and wants revenge for Palpatine.
Actually, I just got another idea that this reminded me of because I just found out in those Ewok movies, they ride ponies in some scenes. So, using Hal’s fan edit as a template that makes Kef-Bir into Endor, we could include scenes of the Ewoks here as being allies to the defected Stormtroopers.