I got a no-name USB adapter for mine and it hasn't killed it in the couple of years I've had it, that's the one I take for travel. You can search for "USB QP2520" to find one.
I know, right. And the other manufacturers are the same, razors/grooming tools that just have a USB C plug are rare to nonexistent. My assumption is that it's down to some regulation regarding waterproofing somewhere. Though of course USB C plugs can be waterproof.