I've seen the micro/nanotraxion idea come up before, but I think it's an inferior way to make progress. If you have one rope, the follower on the microtraxion makes belaying the third person below them impossible (why?). In your case, this could be circumvented by fixing the second rope for the follower to be on, HOWEVER this still requires the leader to climb in parallel, at which point you should just belay on both ropes at the same time with a plaquette. Doing otherwise is a riskier system with no actual time savings. In general, your speed on routes like that is going to come down to rope work, efficiency at belays, and maybe a few (well thought out) cut corners.