

I haven’t checked all of them, but I looked up the first three receivers listed by Eutelsat Oneweb for “land mobility” usage. One was made in the US and UK, one was South Korean, and the one intended for military usage is Spanish. I guess South Korea is not NATO, but that’s about the NATO-est non-NATO country there is
If you accept a lack of gears, a belt drive instead of a chain probably simplifies the most difficult part of actually making it. Best pick somewhere with good roads though, since you’re definitely not making pneumatic tyres or a pump to fill them with