Here is a two hand on one KB snatch variation that started by trying to avoid the callus problem, and provides a different emphasis than the traditional snatch- much more "whole body".
Start with the 1hand snatch overhand grip, and bring your "helper" hand from below to support the fingers of the primary hand during the bottom throw and catch phases of the snatch. The helper hand idea came about because initially bailsnatches were performed with a small towel around the handle which adds a good deal of challenge to the grip ( actually the grasp than crush aspect); It's hard to describe, but easy to experience.
To familiarize yourself with this motion, start with a full two-hand grip on your regular snatch weight without the towel; The load will be spread over both arms and it should feel more like bailing hay than snatching a kettlebell (hence bailsnatches). Keep both hands on the handle until you're very comfortable with the motion. With some practice behind you, you can literally "dial in" the amount of assistance your helper hand provides (by the # of fingers) and change the whole feel of the motion.
The "bailsnatch" spreads the load and can be done for higher reps and/or heavier weight (mid to heavy swing or snatch weight -90lbs in the vid ) than the traditional 1-arm snatch (at equivalent weights); It is also an excellent motion for a crossfit style metabolic challenge.
Try it! and get back with your thoughts.