Many thanks for the survey and the updates.

Rue de Cortenbach/Kortenbachstraat: indeed, access tags can be set here, though only in one direction because there is no restriction at all for eastbound traffic.  I fear that not many routers are able to understand it properly.

About https://www.openstreetmap.org/way/37166997 : yes, it was clearly outdated → no preference between footway, cycleway or path → I made it a cycleway.