Cool man, please post your results if you decide to do the mod, i too like the peter green tone but never thought of getting in it with an RG (or JS
I will post a youtube and PM you if I do the Peter Green mod. Right now on my ESP I have a simple push pull to single coil thing which I put in which I don't want due to the excessive single coil hum. Clean it's OK but with gain it's hard to take thus my preference towards humbuckers when there's distortion. The PG mod is the only way I know to get two humbuckers to get both the Gibson and Fender type tones without hum when distorted.
I want to find a simple non-trem RG with that 25.5" inch scale I desire. If I go the cheap route, I can twirl magnet which will seem to get that Peter Green sound when all pots are at 10 and selector switch is in the middle position. That extra scale length should get closer to a Fender sound than the short Gibson scale (24.6-24.75").
I don't know if I will try a PG type mod with the simple magnet twirl or full new setup like on the mr. fabulous website from Australia first on my Gibson scale guitar first but I know I won't get the same Fender like attack on a shorter Gibson scale guitar. It's truly amazing just how much scale length can affect overall guitar tone with all other things being equal.
All that being said an HSH RG setup with the single coil pickup swapped out with a stacked single coil will give all the Gibson and Fender tones close enough without hum. Of course no stacked single coil will sound exactly like a vintage single coil Fender pickup because the modern stacked single coils are a little smoother and less percussive. The Gibson sound won't be the same as a Les Paul because the RG's humbuckers aren't as dark but fooling with tone knob can dial that in almost exactly.
There's really no one guitar setup that can get all the old school Gibson and Fender tones exactly, but the HSH setup on many RGs is about the closest one can get without having to spend a lot of money and get the expensive rackmount, software driven gear some here use.
I did try a $2,500 dollar rack mount unit (maybe more) that could take any basic electric guitar signal and swap it out flawlessly with a sampled sound so my strat could become an ES-175 exactly or a Takamine 12 string. If money was no object this is what I would do. The software becomes increasingly better so that the tiny nuances of let's say that 12 string Takamine is almost undetectable from the real thing while standing in front of the speakers. Crazy.