Going with the idea of the Grogu rescue openinng Mando movie three, maybe you can establish in the crawl that while making the preparations to fight Gideon, he has the Armorer make the beskar chain metal, as if to say that he will rescue Grogu from the Empire and the chain mail cements it.

I think you could accomplish this by taking the scene in Boba where Mando gets the chain mail and split it into two scenes, one at the beginning and one near the middle. It always bugged me in Boba where after revealing to the coven that he removed his helmet that they didn’t immediately try and take the beskar back from Mando before kicking him out.