I hear ya. Just thinking outloud. I changed to a 20 wt engine oil in that little 3.0 Vulcan, most recent OCI is a mix of 5W20 and 5W30, oddly the oil use went up slightly with the mix, vs. all 5W20. Oil use is generally about 1qt/3000 miles with 5W30. The change to 5W20 gave me about another 500 miles bringing it to a qt/35000 miles. Going back to 5W30 or the mix of 5W20 with 5W30 takes me back to 1qt/3000 miles. I'd love to see what the thinner stuff does, but it would have to be a high quality oil like you are using if there are going to be any benefits. I don't think an off the shelf (if it existed) OW10 oil would help me.
I see your point about cam wear the only way to tell would be a tear down before and after, and the average car buff is not going to do that.