Thank you for this information, it’s fantastic.
I’ve loved ThinkPads for a really long time, and I want to see if I can DIY my own Trackpoint in this keyboard: Post Your Keyboards! - #2237 by patcoll
For me it would be an ergonomic improvement, and a fun test of my DIY skills 
I thought I remembered a GB recently, but I missed it. Apparently this person ran up against the same constraints, so he started another GB thread: https://www.reddit.com/r/mechmarket/comments/nbhp75/gb_sk8707_trackpoint_module/
It would be neat to figure this out and have something practical and usable.