There are mid Sodium Ion based EVs that do 150 miles and they are maybe $10k. Sodium Ion wont be able to get to the 300+ mile mark as they are heavier and bulkier and longer ranges will be dominated by li-ion and the upcoming almost solid state li-ion but that 150 miles covers a lot of peoples usual daily scenarios. The extra topping is the batteries last a lot more cycles too (6000) so after your car has long fallen apart you can use it in your home to buy cheaper night power or for solar storage.
I don’t think modern Raspberry pi’s make much sense unless you are using GPIOs or really need the low power consumption. The 3 and the 4 were OK price wise but the pi 5 is quite close to all these N100 mini computers and they are a lot more performance and expansion compared to a raspberry pi 5 and still quite low power.
Either a Topton or similar N100 based machine or a mini PC second hand is the way to go at the ~$100 mark. The mini PC will be faster and probably more expandable and cheaper but also more power consumption.