Learned something on the interwebs last night. Ended up on the website of a custom rocker manufacturer specializing in shaft mounted rockers. You can order roller rockers in all kinds of lengths, ratios, and (L/R) offset.
I’m sure they cost a bloody fortune, but looked to me like a guy could build a custom Stovebolt rocker set if he wanted.
I didn’t know “custom rockers” were a thing.