Not sure whether you have seen this British initiative:
Slow Ways https://ravenellison.com/portfolio/slow-ways/
Article in The Guardian https://www.theguardian.com/travel/2020/jun/13/how-the-slow-ways-network-could-change-walking-in-britain
It seems like the creator, Dan, has had a really good idea, and that he is doing this with Ordnance Survey. I’ve written to Dan with the following thoughts:
Have you thought about doing this using OpenStreetMap, rather than, or in addition to OS? My concern is that your excellent idea may be held back by OS licensing. “published online and made freely available via Ordnance Survey” is great, until OS decide that they don’t want to support it anymore.
Have you considered having a ‘Waze’-type app that participants (users) can use when they are using the routes, this will award them points for the distance they travel, and perhaps multipliers, for using lesser known or out of the way routes? This sort of award motivates people to do more routes, and this will benefit footpaths and the health of the participant.
Not sure whether this idea has been discussed elsewhere in the OSM world, but it seems like a good idea which will probably grow/ fork, if the licensing is permissive (eg, Creative Commons or similar, rather than a restrictive option. Let’s keep our fingers crossed.