Thanks everyone. Your insights helped guide my research. Here is my plan, if you could advise me on it's feasibility.

A Shimano Alifine 8 speed hub

Center Lock kit for center lock hub to work with 6 bolt rotor

6 bolt attching cog like this

these sti shifters (these ones are ugly IMO)

As for cable routing, I am willing to re-route the cable when not in use, detaching it from the hub and using these to hold it elsewhere