I added a sample link called iNaturalist comments (search) to this taxon page to search for comments containing the taxon name. Look on the About tab under More Info on the right. This is a taxon for which I have added many comments with ID guidance – many more comments, though, than are coming up when the link is followed, since the taxon name was not always spelled out completely in the comments.
Also note that this does not search comments attached to IDs, only stand-alone comments.
It’s not an ideal solution, just something that’s possible using existing curatorial functions. Nevertheless, if people think this would be useful, this can easily be turned into a templated link that would appear and work on every taxon page on the site. It would likely produce zero results for many taxa.
EDIT: unfortunately this currently does not work across different iNat network platforms, because Taxon Links will not accept relative URLs. So my sample link will only work if you are signed in via iNaturalist.org (iNaturalist global); otherwise it just displays all comments. Probably would want to fix this before putting this link on all taxon pages.