A camper with the ability to remove the camper when not needed allows you to use the Mog for other things, its too good of a vehicle to use just for camping trips.
I noticed this camper unit over here in Australia, if you made it with legs on the corners that lift and support the camper, it would allow access to a camper less mog when needed.
https://www.unidan.com.au/portfolio/unimog-ul1700l-crane-truck-48000-2/
Wouldn't be hard to make with your skills, you have the frame, outer skin and liquid tanks that you can fab up, so not ultra expensive as its just your time. (it's normally the interior that costs a bit if you have to outsource.
I see these kind of campers a lot here in Australia, mainly on Landcruiser ute 70 series, when they just rock up into the camp ground, add the legs lower and drive off.
I did notice that these landcrusier campers was that they retractable legs mounted on the frame, saves carrying them around, as long as they are protected it would work.
plus with a side entry, you can mount a motorbike or another spare tire on the rear.
The good thing with your Granby Camper is that you can use it now.