I would like to elaborate on my suggestion. Think outside the box with me for a moment and check this out. Clearly, budget, tone, and body shape are huge hurdles. We will never agree on all three. That said, I think about the headstock. Why? Because it is inexpensive, does not affect tone, and is a permanent part of the guitar. Unlike the other inexpensive suggestions like covers and knobs that can be switched from guitar to guitar and in doing so, thus defeating the purpose of a limited run forum guitar, the headstock could be unique to each member and the overall forum limited run. Now, what I mean is take three to five pices of headstock veneer, (say, curly maple, cocobolo, ebony, koa, splalted maple, whatever, and cut them symetrically or randomly and put them together symetrically or randomly to makeup a oneoff unique headstock veneer. Tastefully done, this looks awesome. I have seen it. No two will be alike but they each will be recognized as forum. McPherson and several boutique acoustic guitar builders offer this headstiock veneer option for there one off custom guitars. The end result is no two are alike, but instantly recognizeable. The headstock could be finished off with the TRC. So even if the TRC is swapped, the guitar will always be known as a forum edition.
No One has to make compromises. Order any guitar you want, SE, CU, SC. Hollowbody, whatever, with artist package, private stock, or whatever, and request the forum headstock. Top it off with Paul signing the headstock in a unique color such as say "forum Blue" will add more uniqueness. A bold color is needed to offset the different color shades of wood to keep the sig prominent. This is cheap, easy, and no one has to make sacrifices. PRS makes up the required number of veneers and puts them on the guitar you ordered. WE then all have a forum guitar that is instantly recognizable, does not affect tone and does not break the bank, PEACE! What ya think?