25 mph works for golf courses, resort, or island use. In rural areas on the mainland, roads connecting towns often have 45 or 55 mph speed limits so unless you plan on staying on the farm I don't think these are practical for trips to go shopping, dumping, hauling, etc.

As for the imports, I saw one of these 90s-era right-hand drive kei trucks at a parking lot a few months ago and talked with the owner. He was a young guy who lived in Boston, said it was super easy to park. Speed maxed out at 70 mph, which is fine for local trips but maybe not for long highway trips.

For people in jurisdictions that allow 30 year old truck imports, and are interested in getting one, there are other countries that use such trucks and have left-hand drive. Taiwan has models from CMC and Suzuki, and I believe South Korea also makes them.