In today's era, where the number of EFi cars has vastly increased, on top of that the number of imported cars, you cannot find each and everything in every small city. Now mechanics started knowing about EFi technology and they can diagnose some problems. The only problematic part is the sensors that vary from manufacturer to manufacturer. For Daewoo car owners, the good news is that you can order any faulty part from the Korea Autos Lahore through any online transfer and they courier the part to you, they are good at it.
As for interior, you are right that it is from 80's era and the plastic items are very fragile and there are no other options than going for some other car's interior like I have seen daewoo cars with toyota and honda dashboards and door cards, since the Cielo dashboard is same style with grey color. Regarding the resale, if you purchase a well kept daewoo racer for 3.5Lac and after sometime you want to sale it in well kept condition, it will not drop its value but it might be take a while to sell.