When you browse products priced similar to a cheapo you get not the cheapest cheapo. That’s usually how it goes. I don’t have much money but I said screw it and got wireless EPOMAKER EK21
One more thing. I’ve just learned some cheapo wireless numpads don’t in fact issue true numpad codes. Instead they “regurgitate” the alphanumeric equivalents of the intended num commands. Does that interfere with Blender somehow?
In case anyone’s annoyed by the “tilde doesn’t show on first hit, then two ~~ show up” issue – it’s called dead keys. To disable it you need to create a custom keyboard layout using MSKLC from Microsoft.