Alex, in BR, I agree that we may have been going the wrong way, for years, in terms of stock rigidity. Of course, you and I believe in positive compensation...not everyone believes it's real, yet. The stock matters in this regard. As Jay said, I think there is a happy medium somewhere, just not sure where. It'll take a lot of testing to say with any degree of certainty, IMHO.
I've wanted to make the time to test the idea more by using a relatively stiff say, 1/4"x3"x "x" inches long piece of carbon fiber or kevlar, attached to the forearm with an adjustable tensioning mechanism. What I have in mind may be crude and unattractive but would allow me to adjust the "rigidity" of the forearm for testing. Form follows function, so once proven, I'm sure it could be prettied up a bit.
That said, if a stiffer forearm is what the op wants, the tubing or rods epoxied into the barrel channel does work well. You don't have to overthink it. Just about any rigid tube or rod will greatly stiffen and strengthen the epoxied forearm. This method works very well on flimsy tupperware hunting stocks. --Mike