My understanding is that you usually need some extra valve stem from the wheel fairing size. I imagine it really depends on each wheel, though. I tend to give about 15mm - 20mm extra (run 80mm on a 60mm wheel and 48mm on a 30mm wheel). Give it a go and see if it works for yeah.
The 6.7 rear is 70mm so there would be an extra 10mm of stem. I'm not sure if that is enough to get a pump on it, but I guess it is worth a try. If I don't have to run extenders that would be pretty nice come race season and well any time.