I'm one of the non-divers and I could get us off the mooring no problem, but I don't have confidence that the other non-divers would be able to help get me on a different mooring ball if needed.
I like the idea of keeping the boat in the slip at Scrub while they dive. The only issue with that is Dive BVI does full day trip dives on Thursdays which doesn't work for us as we have a reservation at Leverick that evening. Of course, it can't be easy.