Unable to answer "Do these traffic lights have a button to request a walk signal?" – Crossing With Pedestrian Signals – https://osm.org/node/7330094893 via StreetComplete 59.3:

Hier gibt es keine Ampel.

Attached photo(s):
https://westnordost.de/p/252286.jpg
https://westnordost.de/p/252287.jpg