Well ok, I'll just minetweaker them.
A few months ago, Leagris wrote a Minetweaker script to not only remove the non-nerfed Forestry wood recipes, but also add GT processing recipes for them:
[GT-5.09.** & Minetweaker-3.10 Addon] Addon Version 1.2.2 - Adding custom Recipes for all Gregtech 5 machines (Now with Fusion Reactor and Ordict support)
Using that might be faster than writing your own Minetweaker script.
I expect it would work with GT 5.08.33 as well, though there are a couple of lines you'd need to remove if you don't have MFR.