The problem with this is that there is no corroborating evidence whatsoever for all of this. As you say, no-one else mentions anything unusual in the sky. And you don't give any evidence for any kind of diplomatic mission either. What would these Magi have been doing at Herod's court? Negotiate the release of the 10,000 Roman POWs of Carrhae? A bit late.

And why doesn't Josephus tell us about such a thing then? Your remark about "hornets nest" also implies they would actually have gone to Bethlehem and would have deviated then from their purported diplomatic mission. What idiot would do that?
And after all, we're talking here about a tale we only know from an author who has other uncorroborated tall stories. Like a 3-hour lasting eclipse (during the Crucifixion), or a massive zombie rampage through downtown Jerusalem (after the Resurrection) which no-one else tells us about.
Brainache's explanation seems much more reasonable: Matthew just wanted to cram another "OT prophecy" into his tale. And made a dog's breakfast of it.