Gene,
just in case something is not 100% clear here - I was talking about the rockers, the brown thingies with the relatively small worn surfaces, in the below picture placed above the followers.
Why not bring those rockers to a shop and ask them to grind nice little convex surfaces on them If you tell them how important these are to keep the valves spinning they'll do their very best probably.
One can read every now and then of such convex surfaces, but all followers I've seen so far (mostly old stuff ) don't show this feature. FIAT ones neither, nor was it implemented on the ones I bought from Stucchi once (the long and light ones). I could see no avantage of such a shape, but the downsides are obvious: only a very small contact area between cam and follower, short line if not even point only.
They may exist, why not.
Hubert