I would re-install them correctly. I have a cam bearing tool, so it's not a big deal.
Not sure how far away the original shop is, but it might cost more to travel there than pay a local shop to fix it?

Drilling is an option, but need to be careful not to raise a burr, or distort the bearing when breaking through the bearing.

On my 360 RV engine with Crane gold aluminum rocker arms, I wanted more rocker oiling, so the #2 an #4 cam journals were grooved (a small groove.)

If using head studs, enlarge the tall cylinder head hole where the oil comes up for a bit more clearance around the head stud.