I should have added, with the lengthy on-again off-again history of partnerships between VW and Ford that is part of the reason I was surprised to see it hadn't been brought up.
Surprised I'm seeing no mention of the Ford 3 Cyl Ecoboost as a possible RE mill. This is the motor that fits in less space than a carry-on bag and puts out 100kW. A refinement of this motor seems like a well packaged, cheap, and more repairable option than a lot of the suggestions. Of course...