I think you have a good plan to get started, so long as you don't try to sell off that it is your own custom insert you should be ok, not to say you have to over state that it is a cut down sleeved echo either, just be honest which sounds like you are. I encourage you to check with Ron as he is the band master, but if you need a one off aluminum or brass band engraved jewelry style I can do those, but not the anodized bands. We also have tone board jigs, mandrels and turning blanks when you get ready to plunge into the next step, but I will warn you it is additive and can drive you mad lol