Re: Two hives one queen?
Most of what Scuba says I agree w/, but adding a queen will prove unsatisfactory. The colony will likely not accept her even though they don't have one. Best of luck, but it will probably be money wasted.
I don't know how you would go about combining two TBHs, but were they Langstroth Hives, that is what I would recommend. But it isn't the case, so others will have to advise you there.
"It's not what you look at that matters, it's what you see." Henry David Thoreau, Mark B