Serious 340 build into 361 HiRPM Screamer

Who makes ductile rocker arms? Thanks know Crane (IIRC) did but not anymore. There were priced right.
I don’t see a complexity issue. I see it the same really. The only other possible point of a failure would be the roller tip. It takes a lot of slamming from excessive lash to break a roller tip axle or otherwise spread the rocker arm tip out enough for a problem.