I made a topic about this awhile ago, but I don’t think a lot of solutions were offered. What I do now is link the other observation(s) in the description; if someone IDs one of the other organisms I leave a comment about the subject I wanted and direct them to the description.
I think this is the best solution if the user doesn’t respond within a certain time frame (I’d say probably a week to month since some people aren’t on often or it takes awhile for them to go through IDs).