1-order a car from here for European delivery and import.
2-simply order car here and pickup at factory
3-order the entire engine and screw it into an MPG-challenged vehicle.
I would have to think there are a few of these factory workers and executives driving around in them and nobody knows about it.
You do not understand the problem the Federal and several state governments have with “high-mileage” vehicles in significant numbers - the collection of fuel taxes goes WAY down, and there is no simple way for them to substitute that shortfall. Besides, they don’t want people to be having too much fun merely by racking up leisure-driving miles.
You can’t import a vehicle to the US that doesn’t meet NHTSA and EPA.
If the federales find it, it will be impounded and crushed with no compensation to you.
You are not even allowed to try and send it back out of the US.
As for the engine swap, you could likely do it in a state that does not have yearly inspections (Indiana where I live has some counties with no inspections). But with the high level of electronics integration currently used, you’ll need access to a lot of technical data to make it work.