Here's how I see it - if you want to avoid "going the Japan route", you don't buy a used JDM vehicle.
I'm in the Caribbean, used JDM vehicles are plentiful here and so are used American vehicles - most of the vehicles I have owned were purchased from local dealers and spares can be sourced from those dealers.
Let's say I want to buy a Toyota pickup - I can go to the local Toyota dealer and he'll sell me a Toyota Hilux, or I can buy a used Toyota Tacoma (the Hilux is not sold in the US, the US gets the Tacoma) - the local Toyota dealer has access to service manuals & parts catalogs for the Toyota Hilux, but not for the Toyota Tacoma.
When I choose to buy the used Tacoma, I am committing to having to "go the US route" to get the parts I might need.
One of the vehicles I owned was a Mitsubishi Pajero iO, a model which was available through the local Mitsubishi dealership, but I bought a used JDM Pajero iO - the models supplied by the local Mitsubishi dealership were powered by a port injected single overhead cam 1.8 liter 4G93 engine, my car was powered by a direct injected double overhead cam 1.8 liter 4G93 engine. About the only interchangeable parts on those engines were the block, the crank & the bearings. Pistons were different, valves, gaskets, timing belts, tensioners, all different.
By choosing to buy the used JDM Pajero iO, I committed to having to "go the Japan route".