I still haven't checked out the routing on a '12 in person, but my initial thought would be to just pull off the sandwich adapter, and plug the holes at the cooler.
Depending how you drive, it may actually make more sense to keep the '12 cooler on though. It should actually warm the oil up a good bit quicker with it on, since the water warms up so quickly. You'd be better off fixing the over-cooling with a block-off plate IMO.
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