Perth to Dunsborough

that 250k? there are a ton of options that dont require a charge

Perth to Geraldton

414km again there are many options that will get you there without a charge, and plenty more that will require 1 stop while you take a leak and grab a snack

you have a car now, so no point in looking again until you need to replace. but electric is a perfectly reasonable proposition for anyone looking for a car today driving the routes you mentioned, especially if you can charge at home.