As a Teryx owner, I can understand your concerns. I'll be trying to trim the weight of mine, mainly because I hunt the trees with it and I could use less weight hanging out there. This would also be an issue with the factory wood. It's also important for me to bring the weight as close in toward the shoulder as possilbe (which is why I want to bullpup the Teryx; it helps already with it's adjustable stock). I'll then consider a hydroform dip to add a design/coating to it, which will reduce the ambient temp transmitting to the metal stock.
You might want to see how owners feel about the ergonomics of the pistol's carbine stock, to see if it's worth the hassle. The factory wood on the Marauder is pretty darn light, even if the balance is off. Cutting out the center of the stock (to resemble the pistol's) and then removing excess length and sections from the foregrip would reduce it and correct balance... ...but it doesn't get you synthetic material.
I think drilling out weight from the Teryx will help a lot, getting it under the weight of the factory wood, with better balance and that awesome, CNC'd bed for the action. Making it a bullpup is a personal preference, due to tilting it up toward the treetops often. If there is room (to drill space) for a solenoid near the trigger-pack, this could be the easiest route to making a bullpup with off-the-shelf parts, so-to-speak.
Prod (tuned by Paul B., LW barrel, RB grips, ACE Folding stock, camo, TKO & JG brakes)
Sold: .22 Mrod "The Toad" (tuned by Paul B., 18" LW barrel, Toad-A-Flage camo)
Sold: .25 TT Mrod w/ reservoir and shroud extensions