I tried that several years ago Ed. It's easy to plug the bypass hole in the cooler with a 1/8" npt. It had no effect on my oil temp in cruise, but I didn't like it because the oil ran way too cool on long descents and it wouldn't warm up before taking off.

Perry

I have to admit that the thermostat is a valuable feature of the stock cooler.  With the warm temps that we still have, warm-up time is not an issue, but I imagine that will change when winter (such as it is) gets here.