So first of all, I know one obvious solution to this problem is to allow enough dwellers to die so that I can destroy a living quarters, but since they're almost all maxxed out I'd rather not do that if I don't have to...
Basically I'm maxxed at 200 dwellers, and because of the tutorial, I had a living quarters room just to the right of my vault entrance. I wanted to stage this with 6 more "vault guards" to help kill off the deathclaws when they arrive. The problem is, unless I take the time to ensure either an all male or all female living quarters, they will get busy and make my female dwellers pregnant, limiting their ability to go out and scavenge. (I do this on a kind of a rotation.)
Basically I want to switch the living quarters I have there with a storage room, but I can't destroy the living quarters because I need it to support the 200 dwellers, and I can't add another living quarters elsewhere because I'm at the limit. Is there any solution that doesn't involve killing off a few dwellers? I'll do it if I have to, but I'd rather not if possible.
Sadly I also can't destroy just 1/3 of the living quarters at a time, meaning I'd only have to kill off 2 dwellers, but unlike building, destroying does the entire room, not just 1/3rd of it like when you build.