Yeah! The unstayed masts are my favorite part, they'd be a good candidate for automatic computer control.
On of the difficulties with proas is that generally you want the laterial center of resistance (the view from the side including fins, keel, etc) to be slightly behind the center of effort (center of the sails). On a tacking boat, the rudder and keel/daggerboard is simply mounted aft of the sails, but on a proa, you must swap the rudders/fins and/or sails. The balestron rig (used on the early harryproa) is about the only thing that works like that naturally - because the boom comes forward of the (unstayed) mast and the jib is attached to that. The center of effort still moves back a bit because the main is usually bigger, which makes sense because otherwise the sail would be unstable and you'd need two mainsheets to hold it in place.
Schooner rig (two identical masts) also works because the masts are far apart which makes the CoE not move very much, this lets you get away moving the CoR less.
On a traditional proa, you have a deep V shaped hull, and probably a oceanic lateen sail (different to the mediterranean lateen because it has a boom as well as a yard) you just move the whole sail to the other end, and steer mainly by shifting the CoR with your body weight, back to turn down forward to round up. You'd have a steering oar too, but it's only used sailing downwind.