I have researched similar ideas, but many sensors, the one you linked included, list an operational pressure range, in this case 90-110Kpa. I am not sure how much lower pressure will affect their accuracy, but I would want to find out before trusting one of these sensors at altitude. 90Kpa is equivalent to a pretty low altitude (~1000'?). Maybe an expert can chime in?
RV-9A - Done(ish) 4/5/16! Flying 4/7/16