The vast majority of those subsidies (rebates, sales tax exemption, government procurement of EVs) you linked don’t seem like they would apply to exported vehicles. This suggests exports would indeed be very price competitive, wouldn’t it?

It works pretty well, and that was without customising the controls. You definitely feel the limitations when doing some more complicated things like wire layouts for circuits, but it can be done. When I later played the Exotic Industries mod, then it felt like it wasn’t quite enough (configuring radial menus helped though).

I played a whole run of the base game without mods on my Steam Deck in handheld mode and found it just fine. It uses the extra buttons on the back quite effectively.