Sounds like a nice idea, I'm gifting away some of my bonchis anyway, so maybe I'm going to participate.
About the fusing Ideas: Correct me if I'm wrong, but I don't think you can fuse two different varieties, if they even fuse, they'll still be two separate plants competing for root-space. Grafting multiple varieties on one stem could work though. Fusing rooted cuttings from one plant should work best, same DNA.