Is there a place in the camper itself to put an inverter? It looks like you've used your space very efficiently. I would want a microwave. It looks like one could be placed on the burners on a scissors frame that would lift when the door was open.
looks like an earlier ad given the smaller number of miles but it's better than nothing.
http://classiccarsexport.com/mercedes-benz/55345-1980-mercedes-benz-unimog-u1300-turbo.html
You might want to try the sprinter forum. I think if you removed the lift and dropped the price accordingly you might find a buyer. It's a nicely equipped platform for a permanent or removable conversion.
I did a quick search for forums that mentioned Braun lifts but didn't see anything...