Since I never could pass up a challenge in high school, I shattered my right wrist racing my dad's motorcycle. Now, I can't turn my wrist much past 90%, and certainly not "palm up". All I can do without a VFG is to rest the forend between my thumb and index finger.
I use the Fobus handguards, but a more Knights-looking foregrip. It makes all the difference in the world. It helps me so much, that I've considered adapting a rail to the underside some of my other rifles so I could attach a VFG and "get a grip".
One thing though, I keep it almost all the way back toward the magwell (only 2 slots left). This gives plenty of room forward to use the forend, or to sandbag, etc.
Bushmaster makes a very functional (but ugly) looking VFG that folds when not in use, ala Steyr AUG. That might be an even better option... but it sure is ugly!