Possible...maybe, if you built one yourself. To my knowledge there doesn't exist such a thing.
Most likely Bung could have done it since they designed the units but unless you are a super stud hardware fabricator and software guru (since you'll need to write a new BIOS for it) the odds are you're not going to get it to work.
Pick up a SWC DX2 if you're interested in SNES backup units. They're good stuff.