Have you tried f/t yet? You may not even have to make that transition. I'm not sure I'd try to stun an animal anyhow...if I had to incapacitate a live animal, I'd go ahead and kill it outright. Much less chance for either suffering for the mouse, or danger for your snake if the mouse comes around at the wrong moment.

I've never used tongs, so I'll leave that answer to someone more familiar with the technique...but again, you may not even have to go that route if you have an easy feeder who will just take a f/t rodent dropped into its enclosure or feeding box.