Importing to the UK, I found there was quite a long customs delay, apparently common with laptops (the shipping itself was only a few days). In particular, make sure there’s nothing in the shipping address that suggests you are importing as a company (unless you are!) as they may wait for EORI numbers and suchlike.
I am also from Austria and am looking to purchase the Librem 5 and possibly a laptop in the near future. However, I am hesitating because I don’t really know what customs issues I will face and what that would mean for me.
In regards to the German keyboard you might have some issues atm.
Due to the corona virus stocks have been delayed and it’s a while before they get any more in. See here.
However in regards to postage and resellers I’m not, last time I checked it was still a while off, there must be some issues.
They are actively trying to get an EU (likely German) reseller, I’m pretty sure they have employees who live in Germany so it’s in their own interest. It’s just a case of time I guess.