I’ve seen guys do it at the track with a hole saw, just to pass tech. I don’t think it’s a process that needs a trip to a machine shop but I DO think you should pay for the recert after doing it.
Why do you feel I need a recert? I am just a weekend warrior out there for fun, this car won't be pushed to its limits. My camshaft declares this to be a max 6500rpm package. Perhaps I'm missing something in my analysis of the scenario?