Chambers at right back wouldn't be the worst thing in the world, times his runs well, has a great delivery into the box and generally good with the ball at his feet. Quite flexible tactically too given he has experience playing at CB and CM. Just a shame he's not more athletic, but I think he's underrated because of it.
I don't see the point in buying a right back for the sake of it if there's not a markedly better option. Sell Hector and Cedric and sign someone young to push Callum.