I feel like you would need something equivalent to an onstage DI Box to make this work....something that takes the unbalanced TT signal, balances it, and also has a little bit of output buffer gain to be able to feed the mic preamps in the V3. Then you would just apply a small bit of gain (depending on your table's output), and that's it.
Perhaps I'm being lazy too but I don't think that just running unbalanced in to the V3 would work.