If I were living by myself, I'd be doing the same thing. My master bedroom has plenty of space for my longarm (which is crammed into a small bedroom) and there's a lot of wasted space right now. I'd be just as happy sleeping in one of the smaller bedrooms. I, too, thought about connecting two of the bedrooms, but there's the re-sale problem down the road. Your plan makes all the sense in the world to me.