Mash:
As a person who has done such things (and more than once
Unless you are extremely fond of your bike, it would not make sense.
You CAN NOT import a non-federalized vehicle. Period,.. but you can bring in all the parts you want at 2.5% duty for ferris alloys etc................
The cost of shipping and licenesing will far out weigh the cost of getting a nice used one here.
Makes sense to do it with Caterham 7, but not an Enfield.
Cheers!