Shake gin, Meyer lemon juice, Meyer lemon zest, and Maraschino with ice; strain into a chilled Champagne flute with a Meyer lemon spiral at the bottom. Pour Champagne. Float Crème Yvette.
Green Chartreuse makes a good float too, if you'd like it to be more of a Royal Word than a high-flying Aviation. Regular old lemon would probably work well for those who don't like the thyme-y herbaceousness of Meyer zest. More austere and funky than a French 75; good for those who want something festive and effervescent but a bit more challenging.
"She was born in 1898 in a barn. She died on the 37th floor of a skyscraper. She was an astronaut." -Bertram Cooper.