Well, as you can see, I've already done a lot myself. I had no need for the clunky aluminum fenders and Hangtime rack. I prefer the Topeak MTX 2.0 system that I used to have on my commuter bike. It's a trunk bag that has panniers that fold out. I had to do some wiring to move the Supernova tail/brake light out to the end of the new rack. On the back of the rack, I cut down an old carbon seatpost and screwed it to the reflector boss. I mount my Varia radar and Fly6 video camera on that. It came with flat pedals so I added Crank Brothers Candy 7's which I use with my Specialized Comp MTB shoes. I can't ride too far without cleats. Up front, I swapped that horrific adjustable MTB stem for a Ritchey road stem that I had hanging around, along with a modified expander plug. Then I added carbon bars and Ergon grips to it, as well as a Hafny mirror.
The Bosch stuff I cannot do. I can't even get all of the parts, so I am having the Bosch guy at the local Cannondale dealer do it. He's going to mount the second 500W battery and enable it so that it shows up on the Kiox. Update all firmware. Set the headlight mode to off after 3 seconds so that I can control it manually. Finally, if possible, he's going to swap the Sport mode for the eMTB mode, which varies the assist from Eco to Turbo depending on pedal pressure and cadence, all in one mode. This is a System 2 bike, not a Smart System, so changes have to be done through the diagnostic.