No way am I going back into an engine a few minutes after I first fire it up to change springs or add a tray. When I turn the key, I expect the engine to not require anything other than a valve adjustment for a long, long time.
If I were that worried about it, I'd add a cam oiling system that could be used during break in, then decommissioned. It would take about 2 feet of tubing.
Then again, I always assumed radical flat tappet cams in 2021 are for the same guys who buy a 6.4L crate engine and put a carb on it.
If your cam is so radical it can't handle a break in, you should be using a roller.