@Surasanji All went well, I'm back home -- had a tire shop recommended to me by a local friend, so 1.5 hrs and a reasonable amount of money later I was on my way with new front tires.
This probably was caused by the recently changed front suspension stuff (or rather the old, broken stuff), but it was on the inner side, only visible with wheels turned to the extreme. Luckily I saw it before heading back to the german autobahn -- I've never had a tire explode on me and I like to keep it that way!
@Surasanji yup, especially as the unlimited parts ofthat autobahn are rather narrow and curvy, see https://youtu.be/ErkO_RJ_x3U?t=170 , and I might have run 180 kph or more, traffic permitting...