This is going to be a sticky problem to solve. New rockers are in the $60-$90 each price range. If you get a set of used rockers, there is the added concern of having used needle bearings of unknown history, at $50 a pop per rocker arm.
Welding and recontouring is tricky and needs to be done by someone experienced. The tip of the rocker arm is a complex, compound curve and needs to be that way to contact the valve stem properly and cause the valve to rotate, as designed. If not done correclty, it may self-destruct in a few thousand miles.
OTOH, one option is trying to re-use the old stock bushed /5 rocker arms that inexplicably had the bushings fail in 1980 at 30,000 miles. I never figured out why, but the bushings wore and also took out the rocker IDs and the rocker shafts. They were replaced by the current needle rockers. Being a packrat, I still have them and plan to take a look.
Sometimes it's hell being a nut for attention to detail...
'73 R60/5 Toaster