TK + LH
Your G* status will get 2 of you into the TK lounge. Why not go 1st to the LH lounge (same concourse, across the way) and sign in 2 of you, then one of you stays in the LH lounge and 2 continue on to the TK lounge? Saves you $27!
Bear in mind that both lounges are in the B concourse and UA int'l flights operate out of C i.e. leave time to transit.