>>2618356I just checked Hydrus, and you can set custom shortcuts to automatically tag stuff with whatever you want. Basically you can do exactly what you were describing.
So what you want is easily doable with Hydrus, the question is whether you want to manage a Hydrus database just for two sets of pictures.
I say try it out, since you might decide that you want to further organize your stuff later down the road. If you only want the one thing you're describing and nothing else, it is overkill, though.