Back in the days when Maplin was a thing, they did multi-adaptors, basically a selectable AC>DC power supply wall-wart with a range of tips. Choose your voltage tip, pin polarity, and that was that. Quite handy for the inevitable wall-wart failures.
I'm sure they're available online still, sure Maplin just got them from China.
This said, whenever I've had a failed power-supply, I just email the manufacturer, and in every case they've sent me a replacement free-of-charge.