I wouldn't swap to a chain on the M3W unless there were multiple belt failures and this were the only option. Regardless of the type of chain, they're noisy.
I still feel that getting the belt centered would be the first thing to do and forgo any sprays just to keep the belt dry and free of clingy debris.
Dan, I agree with your thoughts and comments on this topic.
Sprays, greases, oils, etc. are not necessary for this belt drive system.
If the belt is centered on the sprockets there should be no need for any lubrication; these belts are very tough and are designed to run dry.
One of my cars, which is of a rear engine design, runs a supercharger belt that sits less than a foot behind my right ear [although there is a glass window between the belt and my ear] without any lube and without a sound much more than a whisper.
Keep the belt clean, tensioned correctly, and centered on sprockets; one should have no noise that is heard above the Bevel Box whine.
