Re-inventing SK8835 with chiclets?

[JasonOT]

I've done a bit of searching here and all around t'internets but haven't seen exactly what I'm looking for.

Has anyone gone and taken the Trackpoint Keyboard (and/or TK II) then tried to plug in a chiclet with numpad into its control board (e.g. P5x/P15 style)? Do the pin counts even match?

I'm not opposed to some hardware hacking, and obviously you'd still need an enclosure for it, but I'm wondering if anyone's even tried before I go buying parts to try things out.

This thread is the closest I've found, I think saying the classic keyboard can plug into the USB TK and work, but no mention of my query on having a numpad.