Nice to have finished, with some not very clearly understood parsings like 5a, and then get a late insight to a very pleasing jeu-de-croix like that as a bonus! I'm sure there will be more...
Strangely, I've been unable to find the message as a (truncated, bowdlerised) quote in online searches that include the full message and the speaker's name. I only get a version with the alternative conventional opening adjective, and no explicit connection to the obvious show, that I can see. Probably just me.
The three very cryptic representations of the show took me far too long to spot, too.
...but thanks, Lionheart.