I would say make a rank on Patreon where we get a steam key because of this problem. That is the best way for those in germany to get the game on steam. Make the Patreon rank for example the same price as the steam price! Would get you also more then on steam because of the 30% you pay to steam. But im honestly not sure how you get steam key's for your game is something i should read in to my self. :D