The thing I talked about at @sotmeu is technically done: https://geoscribble.osmz.ru/ now presents a list of walks, grouped by user, date, and region. Sign in to filter by yourself, and click the "Done" button when traced the scribbles into OSM.
First thing I found out is that of 7 places I used the scribbles, 5 I forgot about!
Next thing would be to style it a bit, and describe how it works somewhere.
@everydoor How does it work?