Right, PBS is Professional Bowhunters, and they have a similar discussion forum called Cyber Campfire where Joey has done a lot of detailed discussion of his methods.
Some of the threads around here have been pulled back up in the last couple of days and are well worth reading.
The wires that attach to the top limb can be bent, and I'm sure would work on longbow limbs. The bottom bracket though does need to be attached somehow. The bow that I have been using has a stabilizer adapter installed.
I think AMS sells and adapter that can be used for mounting a bowfishing reel on a longbow - I'd bet that you could adapt something like that to make it work.
The biggest disadvantage I have found is like I mentioned about not being able to see my arrow hit. You can cut the sight window open more, and I will be playing with that myself before season opens.