I hate to be the bearer of bad news, but nearly all the aftermarket sails you can buy for kayaks out there are downwind only sails, can't sail up wind, or even a reach ( a reach is broadside to the wind). So even with a dagger board or pointing your mirage fins down, won't help a lot. Another shortcoming of the V type sails since they are kind of preset to whatever setting you are using, if a gust comes up you will tip over faster than you can possibly imagine. They are very difficult to quickly release to de-power in the event of a boat wake or a sudden gust from a new direction (believe it or not boat wakes are what get me the most, and I've gone swimming quite often).
However all is not lost, the designers at Hobie thought of all this and designed from the ground up the perfect sail system specifically designed for use on their kayak lines (all Hobie Mirage Kayaks, including your Revolution which in my opinion is the best of all kayak sailing boats), and more importantly work best when you just happen to have a mirage drive propelling your boat. And the best news is the Hobie sail kit is less expensive than the PA sail system (and most others as well), It's available either online or through your local Hobie dealer.
The Hobie Kayak sail is a proper sail, and you can sail all points including upwind (against the wind, no different than a proper sailboat). Actually if your willing to pedal while sailing you can actually point closer to the wind than a real sailboat like a laser or sunfish could ever do. The Mirage pedals work as your daggerboard, whether you have them pointed down or you are pedaling lightly (works the same either way, actually better if you continue pedaling lightly). And it is designed for their kayaks and can be quickly released (de-powered) in the event of a gust of wind or powerboat wake by just releasing the control line (this is really important on kayaks).
With the roto furling kit (also available from Hobie) you control how much sail you want to put out and you control the speed. If it gets to gusty and dangerous (which can happen quickly) just furl the sail up around the mast and pedal to safety.
If you plan to sail in rougher conditions like open ocean, Hobie also makes and sells an inflatable pontoon AMA system (called Sidekicks) that easily mount to your Revo to prevent tipping over (plus they are inexpensive compared to any other comparable options).
Bottom line you already have 99% of what you need to do exactly what you want to do (which is what the rest of us use the Hobie sail kit for), just go buy that last piece of Hobies very capable sailing kayak gear (the optional sail kit itself). You already own the best sailing kayak on the market (bar none).
Hope this helps you