I had a spare foregrip and decided to see if I could do it. I did! These handguards were your basic G3/HK91 wide handguard. They didn't have the lip for the normal folding bipod, don't know why... also it is grey... probably from a "ban friendly" build I would guess.
I just sat down and used a dremel sander and lots of patience. It locks up quite well!
Now I have the benefit of the heavy bipod AND the wide foregrip:
Yes that's just a mag body