I did pick up my Cali from the factory in Hannover, infact my avatar pic was taken there (you may recognise the background with pics in the weblink above).
I wasn't so sure, but with hindsight I can certainly recommend it. Fascinating to see how from a coil of steel a T6 is made, together with the technology used by one of the biggest manufacturer.
In addition free lunch with a delicious burger and soda, and a 10% discount to buy anything from the gift/accessory shop located inside the Hannover factory. Of course I picked a big ticket item, the tailgate bike rack and drove home with it. Other benefit you get extensive explanation of how the Cali works by a competent guy as opposed to a dealer "expert". Things are getting better in Germany re: Covid, so I think it should be possible.