I've tried skipping the leather for a few days and using only my balsa just to see what would happen. I only have balsa with Crox, the shave was alright but the edge deteriorated quickly.

Maybe with some other cutting medium you would get the edge to last a little longer, but I think you'll be needing some leather.

Just my .02, someone with more time on the blade will probably chime in with a little more insight into alternatives for you.

Good luck, and enjoy the ride.