head off and throw a flow restrictor in the oil galley? that would be a reasonably easy job as I take it the motor is out or the head is off to fit the oil cooler?
or dry sump,
real dry sump, drain all the oil and run it without any, you always hear problems of ppl who run the oil low then the engine fails, but how many have you heard of people running the engine with NO oil and having a problem huh?