Decision has been made. Basically, we have decided on Option #2. I am working on creating a more opaque barrier on the divider fence between Suede's pen and what will be Isaac's pen.
Rex will have 23 hens, including all the Barred Rocks and the two Delawares (they pick at Ike's wattles and I'm afraid in a smaller space, they'll be even worse about it) and Nugget will be returned to the main flock as well, since I'd like her to be with the two younger Buff Orps. Eventually, they'll probably pal around together, if my experience is any indicator.
Isaac will be moved to the former old hens' coop and will have the two big Brahma hens, Tiny the half blind Ameraucana/Sumatra who can see the big white rooster quite well, June the EE who roosts next to Ike every night and keeps Tiny in line and Emily, the black Rock who goes broody once a quarter yet never finishes the time period to hatch an egg and who is low on the pecking order like Tiny is. So, Isaac will have 5 hens in a nice variety which he seems to prefer to his own Del girls.
In the bantam coop will be the 7 D'Anvers, including the 4 little roosters, Molly the standard Silver Phoenix, Shadow the banty Cochin terror and Reba and Sunny, the two oldest flock members who are going on six years old and are no longer laying. We'll probably lose them both before the end of the year and I'd rather not have them with a big rooster to hassle them. I think they can handle the tiny roosters with no problem and this coop has no steep ramp for them to negotiate.
Thanks to everyone who gave me great input! I'll update when the switch has been made in a couple of weeks. Should be interesting to put Rex and his 8 young ladies in with the main group and watch the fireworks.