Really? So you guys really think someone is going to sue you because they decided to modify their bike with a non-OEM farkle?
Come on now. You must be kidding. If that was the case then nobody would ever modify their bikes. Nobody would dare to make or sell any aftermarket accessories. Brodie would never have come up with a fix to the ignition switch design that Yamaha has recalled and is yet to really fix.
Whether it is a manual CCT or some ratcheting design from another bike, I fully intend on finding a substitute for what amounts to a substandard design OEM tensioner, and get it into my bike before another 10k miles passes (I'm at 30k now). I know there are a bunch of others in the same boat. You don't have to make and sell them, but sharing your findings (measurements, similarities to other tensioners, etc) with other owners who are in the same boat is what makes this forum work.
If you are too paranoid, too afraid of potential consequences to share your ideas, well I just feel sorry for you.