Programmable keypad

Hi all
I am nearing the end of my build of a simple generic sim mainly using saitek
hardware. the problem I am having is finding a small programmable numpad or something to this form the reason for this is so I may attach it to my sim and use the numbers to make contact with atc this is currently done using the numbers on the keyboard but not the numbers on the numpad which i would like to use so I may just purchase a single numpad.
Kind Regards
Darren

Just purchasse a standalone numpad--cost close to nothing on ebay ,and assighn buttons via Fsuipc for Atc

Regards
Joseph