Drill and easy out it out. OEM is the best option for replacing the plug. I've never actually gauged the thread but have reduced the plastic plug thread DIA to remove most of the friction as well as a light dab of grease on the threads. I've had it out a couple of times since, no issues. The plastic plug thread reduction was done by chucking the plug and a small tool to cut the thread a hair deeper and sandpaper on the OD after. Slow and easy trial fits along the way. This plug does not need interference fit because the o ring locks it in place when snug. Snug is the key word here.
Ron