Hi River
Crap shoot is a good term for this situation. One of my friend beeks suggested:
removing all queens, wait 24 hours
stack all three nucs with newspaper between them
intro new queen in the middle box, or top box would prob be fine
check back in 4-5 days and hopefully find released queen alive
check back in 7 days and hopefully find eggs
I'm not against banging all the bees out onto the lawn and let them find new hives to live in. But all the bees in these three nucs would make a very nice sized single nuc albeit some of those bees will be old.