What you could do, and probably should do, is do a combine now. Especially if you have other colony(s) that are lagging. The queen lays the eggs, but it is the bees that make the bees. The growth of a nest is limited by the number of bees looking after it. More bees make more brood and more brood make more bees and more bees make more brood and more ..... see the point? -> the growth of a colony is partly the queen but mostly the bees. Queens need bees to grow their nests. More bees, faster growth. Fewer bees, slow growth or stagnant. Too few bees (critical mass), contraction and die out.
It is late in the season. The likelyhood of a successful new queen is between very little and none. Also for strength build-up there is very little time left. A harsh reality is they have only one brood cycle to go then they will be in full winter mode. It would be best to make it a biggest brood cycle possible by combining bees.
You could do a combine and actually keep two queens working together for a couple weeks. Then kill the one being superceded attempt. Put a newspaper on the other colony. Put a queen excluder on top of the paper. Put the superceding colony on top, AFTER you have destroyed the queen cells, but not the queen. What you will get is more bees raising more brood and two queens laying. In one week check the top box for queen cells, destroy them. In one more week check the top for queen cells, destroy them, and kill the queen, remove the excluder, and reconfigure the frames into a proper winter brood nest arrangement. Then add a ton of feed to fill it up. Result is the combine but also with a large brood about set to emerge the following week. It may even be possible to take one or two capped brood frames out to help that third colony at the time you kill the upper queen and are reconfiguring the frames.
Just an idea. It will work stellar if you are clear on the plan, are up to it, and have the time.