Doug,
I posted this last time you asked-NOTHING will keep temp in the
oil below 50 degrees ambient at 60+ MPH-including NO oiler cooler. Ask how I know. If you want to give your precious NOS parts longevity, forget driving in those conditions. Period.
Also forget heaters, seat heaters, tops, hot vests and all the other junk for cold driving. No originals had them except tops-it's not what they were about. You say you don't want complexity and needless expense.
It's your money and your car. I will not join in after the torrent of nonsense that will follow.