Well that was a bit daunting. Ok, frustrating but in the end, doable. Might be worth sharing some experiences. Setting up Bootcamp Windows setup would not restart and complete the installation with anything plugged into Thunderbolt Ports. Took everything out and used keyboard and mouse wired into USB ports. Used HDMI to monitor instead of TB3. Voila! Magic Keyboard and Trackpad not detected by Windows until plugged in with lightning cable. eGPU - TB ports work a lot like MBP. Boot to on board graphics. HDMI in. Bootcamp must be default Startup Disk Plug TB3 cable connected to eGPU with displayport to monitor and Windows will detect. (Furthest right port when facing Mini) Download and install latest drivers from bootcamp drivers.com and run setup. With nothing else plugged into TB3 ports you should be able to boot. Using adjacent TB3 port will crash Windows. Try your luck. After a few freezes I went from left to right plugging in TB devices. Have still not used TB3 port adjacent to eGPU cable. That is vague, but it works. Typing this in Windows now.