I would suggest the Discord forum personally, as they are likely to get the most exposure to various tagging issues there. Maybe even a sub forum, “tracks” under Oceania (if possible)?
Suggestion has also been made that the List may be the easiest to contact as it only needs an e-mail, rather than having to have either an OSM or Discord account?
What do you reckon - is this something that could possibly be sorted by having a general OSM-AU / OSM-Oceania e-mail address, probably though OSGeo?