Well spotted: I hadn't noticed the way is already tagged as stepping stones.  I agree it makes sense to remove the tags from the node in this case.

Unfortunately taginfo shows nothing helpful about other tags used for stepping stones: https://taginfo.openstreetmap.org/tags/ford=stepping_stones#combinations

However comparing https://overpass-turbo.eu/s/1xcR and https://overpass-turbo.eu/s/1xcT suggests that flood_prone=yes has more use on stepping stones than intermittent=yes