You might want to look into split vanity address generation so that any buyers you find can be sure that you don't know/can't share the private key for the address you generate.
Also, if I can figure out how to implement it would you be interested in partnering up for this type of business since it would take two people to generate the privkey for the end client and it seems you have a pretty good hashrate and hopefully I will soon too, lol...
Let me know if this interests you!