Not wanting to get too political Denny but given recent events concerning our independance in Scotland i'd happily immigrate if you folks would have me!
My wife on the other hand? Not so much......

I even have a wee business plan all worked out (in my head at least)
Coincidentally my Dad was offered a job working for F*rd in Dearborn in the late 70s and we very nearly made the move but due to unforseen health problems within my family sadly that plan never came to fruition.
What could've been......but then I may have gone to the 'Dark side' in that instance.
Thankfully there
are vendors here specializing in AD truck parts but they tend to concentrate on the more common bulky stuff like grills,bumpers,rust repair panels and tailgates etc,but when you get down to the smaller detail stuff it's not so good.
One of the the biggest problems is not only shipping/import costs but timescale,waiting weeks for parts in some instances is no fun.
In saying that, I do also miss being able to go to a specialist store or having a root around a boneyard and having a face to face conversation with a real live person or even the junkyard dog...!
To be honest I have had it relatively easy compared to some of my European
cousins.
Most of the other countrys you mention did in fact import or build CDK kit Chevys and GMCs so they have a slight advantage in some respects with perhaps Japan being the exception.