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Slightly OT but when I hire a car overseas I use a different CC to my everyday one. Once I've returned the car and any invoice is settled on the day, I block the CC on my phone app to stop "mysterious" charges being applied at a later date. If I need to use it again I'll unblock it and then re-block it later. The chances of a previous 'mysterious" charge going through in that short period are pretty minimal. I'll wait until I get a letter.
That's a good idea. The Wise card I think allows you to generate 3 'burner' (temporary) CC numbers which would work here.