There's information on the internet on baking biscuits on a stove top. On the other hand, we have a Weber Q1200 and they get pretty hot with the lid down. You can get a griddle to fit them, which is what I'd do, then put your biscuits in a cast iron skillet on top of the griddle. This should prevent them from overcooking on the bottom or burning first. Or use a tin pie plate. You'll have to experiment with the setup. I don't think I'd use a pizza stone because I've accidently had them on the stove and lit the burner, and busted the stone in half. They don't tolerate direct heat which is what would happen in the Weber.
2011 Bighorn 3055RL, 2011 F350 DRW 6.7L 4x4 Diesel Lariat and Hensley TrailerSaver BD3, 1992 Jeep ZJ and 1978 Coleman Concord Pop-Up for remote camping
Dave & Renee plus (Champ, Molly, Paris, Missy, and Maggie in spirit), Mica, Mabel, and Melton