i don’t think regular users have an efficient way to do this.
why?
you might be thinking of this what we’re talking about here: How to exclude observations with disagreeing IDs? - General - iNaturalist Community Forum. the thing i made for that may or may not be relevant here, but it doesn’t allow you to filter by number of identifications, nor by number of disagreeing observations. it can display number of ids and also can display disagreements in a certain way though. example usage: https://jumear.github.io/stirfry/iNatAPIv1_observations.html?exact_taxon_id=326683&place_id=1&per_page=200&options=idextra.