Sounds intriguing. I've printing almost exclusively in gum for a few months now. At first the decision was economic, but now I'm hooked.
Regarding printing on glass...no dichromate stain, no pigment stain. Sounds like a winner, though I can foresee the gum washing off in soaking. Also, since one can rarely achieve a really sweet print on the first pass, how do you intend to register your neg?