You did your best and that’s more than many would have even attempted!
Rubber-band as much brood and food in as you’re willing and able. This can go in any colony if you’re certain they’re healthy.
Your temps are warm there. If you have brood in the box they’ll make a new queen if she’s not with them (provided the brood is still viable and young enough). I wouldn’t keep them locked in for more than a few hours, at most.
You can combine them with a newspaper between each colony (cut some slits) and lightly spray the queenless part with 1:1 sugar syrup to mask the other queen’s pheromones.
Keep asking questions if you need better answers. There is a beekeeper in Vegas that does a lot of cut-outs. I believe it’s @Vegas Bees
. You could nudge them and ask more specific cut-out questions.
Best of luck!