Update time!
The chicks are just over 2 weeks old, and are doing great. We were 12/12 on eggs today, meaning either someone laid 2 eggs or both bantams have gone back to laying even though the chicks are still pretty young. The 2nd hen that went broody has not been a very good momma, leaving her chicks to fend for themselves while she wanders outside scratching about. She has also been up on the roost with the other girls for the last few nights, essentially abandoning her 2 chicks to the night. She was staying on the ground with them before, but something changed her mind.
However, my little Japanese Grey has been an exceptional momma! She spends 24/7 taking care of her 4 chicks, and they seemed to be developing faster than the other 2. On top of that, when I went out to lock the pop door tonight, we could not find the other 2 chicks...until we looked under her! She had been running them off prior to today, but now it seems that she has either adopted them or is at least letting them sleep with her to stay warm. I have a heat lamp in there as a backup, but now that I have seen all 6 chicks with her, I am confident that they will all stay healthy.
Either way, the experiment of moving the last 3 eggs under the 2nd broody was a success in that it got her off the nest and back into laying mode. The fact that the 2 chicks are now back with the "good" momma is a bonus.
I'll post some pics later. 4 of the 6 look like they might be frizzles because the feathers on the wingtips are curling right up and they look like the frizzle chick pictures on feathersite.com.