Nice combo! I’ve got a trackpoint working on my framework/frankenpad too.
You can get a mating cable for the eDP connector on digikey. I posted links here: Mainbord screen port to eDP cable - #8 by Karl_Buchka
I designed a board that adapts it to an iPad display panel, but modifying the design to suit a mini displayport connector, regular display port connector, or even other eDP connector would be a pretty trivial mod. All the design files are on my github. framework701c/PCB/eDP Adapter at main · basketofkittens/framework701c · GitHub