I feed all my snakes using a sheet of printer paper, even my 7' retic and big boas. Sure they might not be on it 100% of the time but a piece of substrate wont hurt them. Lime mentioned, it might be easy to move them now but when they get big, it wont be easy nor fun. You stress now, wait until you are moving a 6'+boa that has the dinner bell light turned on.

The easiest way i do it even with my big ones is give them the food first with tongs. Then once they are wrapped on it, then i just lift the mass of snake and food and slide the printer paper under the mass and put them down on it and then close the door. Usually they unwrap on top of the paper and eat so if anything, maybe a little of the rat, rabbit or guinea pig is hanging off but my big snakes lift themselves up when they are about half down with the food anyways so nothing is on it. The little ones are still small enough that their whole food and them are on the sheet still. You can also use thick cardboard like Zincubus said or even big paper dinner plates or newspaper. Then once they are done, i just wait until they crawl off the paper and then quietly slide the door open and reach in with tongs and grab it.