Royalcore probably is the most rococo aesthetic out there. If you focus on the Marie Antoinette phase of this aesthetic I think it gets closer to what you want. Found this nice article in the same site
The 80s movement New Romantic was heavily inspired by Rococo decadence, but with a punk twist thanks to the fashion designs of Vivienne Westwood. (Rococopunk, I guess.)
Adam Ant did a pirate/highwayman variant of the style (as did Bow Wow Wow).