In reply to BStar:
Revolver efficiency is going to be around 70-75% if the revolver is working perfectly and the rope stays correctly orientated. This is better than a biner but worse than a dedicated pulley.
Apparently, you should put the best pulley on the bottom, the moving pulley. It's much more efficient. The redirect doesn't matter as much (counter intuitive). So if you are going to use a revolver and a pulley, then the revolver would have to be at the anchor side for the greatest efficiency (thus you would want it to be locking). Although one has to factor how much friction is in whatever progress capture you use and therefore a pulley with a smooth autoblock (microtraxion) might practically be more efficient there vs something like a garda hitch.
The microtraxion at 85g, 91% efficiency with an autoblock is pretty sweet, has loads of uses but not all for the trip you are going on. It would work as a beast of an ascender if you are the one that falls down though. It's worth bringing one or two of these. for 170G in weight you'd need no prussiks or pulleys and you'd have a really efficient system. It's spendy though.
Post edited at 20:24