Or, set up the rules to allow people to use whatever mousetrap they want, as is the case for tillers, tiller extensions, mainsheet blocks, side deck cleats, and a few other things. Nobody has yet explained how the class benefits from mandating this particular solution, as opposed to letting people try out their own solutions.
When I sailed Moths, albeit 30 years ago so dont know what they do now, but we used a simple track and slide which worked very well. Available off the shelf from any boat chandlery. Cheap and very efficient.
Many people may have tried this new sleeve out, and say it works well, but was any of them ever asked if any improvements could be made to it.