[Pompompoms]

I think you have said it yourself, you can manage two cages at a push. Hamster keeping shouldn't really be at a push, it should be enjoyable and enriching for both you and the hams. Should you keep the pair and they fall out, you will be at a push. If it were me in your position I would keep the single ham and know I could give him all the attention he needs, then try to rehome the pair to someone that is in a different situation and able to keep both separately should it come to it.

I don't think I'd leave the little one in just the bath to be honest, you don't have anything at all, no bucket, no tub? Washing up bowl, large mixing bowl you could clean and put in the bath to keep him safe should he get out? Do you have a storage box you could empty for the night?