Don't know if it will work with a USB numpad, but there's a freeware program called Sharpkeys that I use on my laptop to make the Capslock key into a Windows key. It might do what you're looking for.
Back in 2024, Microsoft made headlines by introducing the first new mandatory PC keyboard button in decades: the Copilot key. Donning the company's signature artificial intelligence logo, this Copilot ...