I blew $50 on an non-lcd (but backlit) 5x5 keypad from AliExpress.
It uses the QMK system for setup, which is open-source, but it's complicated enough that I keep putting off learning it.
Cheap alternative, though. You can print on acetate and slip labels under the keycaps. A pain, though, and yours is very nice!
Back on Live, I used a $5 laptop-style USB numpad, with stickers on the buttons, but it appears Win10 conflates all numpads, so I needed something different.