Wow, that sounds to be quite the journey but also kinda stressful to deal with. I have anxiety and stress issues. I get stuck on even minor details and problems in life and so reading all that, that sounds like a lot to deal with. Glad they're having a good 2023. You did everything you can and the ants look great.
Just to get it straight though, the old queen died, those workers just continue living, then you got a second queen and brood boosted the new queen with larva etc from the old colony, but the workers from the old colony you kept them separate from the new colony. And the new queen is now thriving as shown, right?
I guess that's why I only plan to keep one or two ant colonies, everything is nice and happy now, but if bad things start happening, the stress would be too much for me to deal with.