My only concern with that would be the RTBS, as they get very aggressive and territorial as they get older. Otherwise I see no problem with a couple of keyholes, just make sure you have plenty of plants, real or fake to give them hiding spaces and places to call their own.
guuurd and i will add lots of plants will amazon swords be ok as i really like them and they are easy to look after..i was watching them in the new LFS store that has opend near my college and they look top plus this is the only LFS that cares for the fish aswell i asked the guy some daft questions(on purpose) and he set me straight