Came across this just recently and was hoping someone else had something better than what I had planned. I haven’t done this but thought of it too late and wished I did.
First we used non-reflective glass over green. However, we had some trouble with the refraction and the shadow doubling effect the glass gave. So we finally went with acetate over green. It was ok but the shadow the hand left was pretty harsh. Also it didn’t key well and I’ll tell you why.
With all green screen shooting, you want to make sure your subject is as far from the green as you can so you don’t get as much spill and you can blast the green with light. Also no shadows. If we use this same concept to the hand drawings, it only makes sense that the artist should be drawing on a non-reflective glass table with the green on the floor. I imagine the table should be fairly large. I haven’t exactly tried this yet but I’m betting everything that it would work perfectly.