Perhaps consider a visit to New Zealand and buying one there if you can’t import one from Japan (keyword “direct import”), although your total costs would be high. We are friendly buggers over here, so you are not likely to get ripped off unless you are a numpty. Buy an unregistered spare one for parts - used farm ones without plates get sold much cheaper.
https://www.trademe.co.nz/a/motors/cars/suzuki/carry/search — all used imports from Japan. Note prices are in NZD, reduce prices by 1/3 to get to USD. You can get GST (sales tax) refunded on exports but it might not be much money because second hand goods are zero-rated?
I really wanted a 1.3 litre 4WD Suzuki Carry a few years ago, but they really hold their value so they were not cheap enough for me. USD8000 for a 20 year old ute! They are in high demand in NZ.
I personally would avoid the Subaru mini-truck: I think mechanical issues and access to parts are problems. I also looked at the equivalent Hyundai mini-truck, but the Suzuki is probably the best bet.
Japan has regulations that make old vehicles expensive to keep, so they export them before they get really old. New Zealand buys a lot of second hand car stock from Japan. If you need something 25 years old, then New Zealand might have more stock.
We don’t salt our roads. Anything that has spent all its life in dry areas like the Canterbury Plains would be best - don’t buy if it has been long periods in wet climates. Avoid anything that has been on the coast - avoid sea-spray rust damage (don’t buy from my local area, New Brighton).