It is better to have a new sub $1000 car, or the very used car with a lot more luxury features (you know at purchase time if they work). That isn't a clear cut choice. Also we don't know how long those cheap new cars will last - it could be a lot more expensive than buying the used car with a good supply chain of parts and a proven history of being maintainable (remember that in these countries people are more likely to be willing to do the work), the new EV could well be a lot more expensive in the long run depending if it isn't well built.
There are fewer moving parts in most EV designs, so my impression is that a "good supply chain" of ICE parts is still a "great supply chain" of EV parts. Most electric motors are expected to outlast the cars they are inside and rarely/never need direct maintenance. The biggest unknown in long term maintenance of EVs is batteries, and right now in general modern EV batteries are exceeding expectations which is why it is still such a long term "unknown" because overall statistically batteries are lasting 15+ years in cars and it might not be surprising if they last longer than that we're only just now getting to cars old enough to start to see real world age on the batteries.
Chinese manufacturers already have found ways to produce sub-USD$1000 EVs. They barely meet US "standards", of course, as they aren't massive beasts of steel for a family of four girthy people, intended for a daily commute across the Ozarks, and cargo/towing capacity for thousands of pounds. But, they are a game changer for small, poorer families already in China and places that can easily import from China. As economies of scale continue to increase and Chinese car exports increase at world scale, there's in theory going to be an incredible step change just based on cars already available on Alibaba and before considering the effects that will have on car manufacturing competition.