[SS904]

The zerk fitting idea would be a possiblity, but I think you'd still have to pull it all apart to then pull the bearings to drill the cases and maybe the needle bearing shell too if they have an outer shell.

My personal opinion here is for the effort and even possibility of causing some damage to the engine cases and bearings by drilling them out it is best just left as is. There isn't really a great need here. You can go years with out doing it, some never do it. Add to that, they are caged needle bearings on both sides, not sure how you'd drill those out without destroying them. If they were plain bearings, maybe...