I think this kind of thing was discussed on MTBR recently. I believe the consensus was that it could be done, but you want to be 100000% obsessive compulsive about cleaning both tubes, no touching it after cleaning, and do some serious research on what epoxy you use. Also, be careful with the epoxy fumes from that stuff!

That said, I bet if you asked around, you might be able to find someone with some O/A tanks who might take you under their wing. There is a subset of the population that loves passing on knowledge/skills if someone's willing to give it some real effort.

Cheers!