Could these be done in the oven?

Yes! What I would do is wrap them in heavy foil and cook them low and slow - 225 for an hour or so, then at the end unwrap and run them under the broiler to crisp them up. The longer on the low / wrapped stage, the more they will be fall-off-the-bone, and ideally you really want to grab the meat and pull it off with your teeth, but I HAVE done ribs much longer and they fell off the bone on their own ...