Unable to answer "Is there a public bicycle pump here (at least when it’s open)?" – VanMoof (Bicycle Shop) – https://osm.org/node/561152866 via StreetComplete 58.0:

Shop is closed. Now Wolke Grow Gmbh, a growshop chain, selling growth equipment for Cannabis.

Attached photo(s):
https://westnordost.de/p/221071.jpg