Considering how big a thing custom keyboards are on desktops, I could see a very viable market for more keyboard options as an upsell. If they swapped out the entire case top (or at least a large panel including the trackpad and keyboard) as a single FRU, the options could be impressive.
Regular keyboard with stupid trackpad: included
Backlit keyboard: +$30
7-row non-trackpad keyboard: +$60
7-row backlit: +$100
All glass programmable touchscreen monstrosity: +$400
Still also prefer thinklight to backlit keyboards but that's less of a necessary