How noticeable for others would it be if I would shave it completely?
Most people are not that observant and probably wouldn't notice at all, believe it or not. To the general population, your head is already completely shaved. Give it a try; it will only take two or three days to get back to where you are now.
A better choice is the Conair Clean Head Shaver.
Does anyone know where I can get this thing in Germany?
ALso look for the Coanie Clean Head shaver. It is a true clipper with a head hsaver attachment that fits to a head. Like an electric razor but deisgned for the head.
It seems that there is no distributer in Germany.
It would probably be easier to get it online and pay the extra to ship it to Germany.
I have the Conair HG300 C CleanHead