I also have that Gunson system. The thing is, it's not just easier, it's actually a better bleed. I have run into situations where no amount of pedal pumping would dislodge some air bubbles, but a pressure bleed did so easily!
The only thing I would recommend is that you use some pretty low air pressures on older Alfas as sometimes 10-15 psi can be too much for the reservior and associated rubber seals to take.
The way I deal with the issue of running the remote reservior dry is that I have the same size bottle as my catch can. When the catch bottle is close to full, the reservior is almost empty.