Thank you for bringing this little item to its own topic.
I hadn't responded previously, because I flat out had no solution in mind. Now I do.
I think that it would be fairly easy for me to go back to the original messages cited, and edit in a note such as "Nominated as a Post of the Month by _____". I can put it in red, so that it stands out.
In a general atmosphere of (as I see it) too many rather trite messages being posted (over the past 2 months, we have
averaged 160 new messages per 24 hours), the nomination messages have been very restrained and of high quality. I think that there are a substantial number of equally qualified messages, worthy of POTM nomination, that are going unnominated.
Adminnemooseus