Even a Dacia Spring with its 900kg is slightly more expensive overall to run (in my circumstances. I could charge at home, but don't have solar panels atm), and a lot more expensive up front to buy (used).
It has over 304k km already, and it runs perfectly well with some occasional maintenance and some mechanical sympathy, but I was considering alternatives in case something were to happen. Conclusion? Just buy another one. Suzuki Celerio is the only one in the same ballpark, but it's about 2k EUR more expensive. And I love my Daihatsu.