Soldered the buttons to a piece of perf board I had with some old wire lying around....crimped the ends with some jst connectors and put heat shrink over them to keep from shorting.  They really should be DuPont connectors...I should buy a set from digikey.  If only I had a gift card....  

I used this video as a basis to setup a pro micro so it can be programmed through the pi to customize the buttons as needed.

The wires slid under the 3d printed buttons which press the wired buttons when pushed on.