Part of the EV driving mindset is being sure you have enough power (or access to) to get where you're going before you set off. It becomes second nature very quickly and you hardly even notice you're doing it.
Here's an exercise you should do. Hop on google maps and look at the area around any place you are likely to go and add EV chargers to the search bar.
E.G. Carcassonne - As you can see below there are plenty of chargers there, even some 300kw ones, so in your scenario above you'd have topped up in Carcassonne before setting off for the return journey.
On a warm day my car could do that 440km run without having to charge but I'd always top off before setting out for home just in case of diversions etc. I can charge at up to 150kw and 20 minutes at that speed would get me 50kwh or 260km extra range (or more depending how you drive).
Find local businesses, view maps and get driving directions in Google Maps.
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