@trregeagle @kyle @purism
Maybe the part with using #nexdock360 and #librem5 as a tablet is a bit far fetched...
All the rest is working for me just as @kyle described it. I extended his solution with an external usb-c dock to have the #librem5 charge (no matter how full I connect it) when the combo N360/L5 sits on my desk at home connected to external power.
By doing so I even can switch off the N360 and keep the L5 charging and connected to my lan.