Don't bring the champagne.....as other posters mentioned, not allowed....Just have what AA is serving that day....

You can bring the tin(s) of caviar, just don't forget to ask for the caviar key (and if you never used it before, learn before hand; its a turning a door knob action, not the typical pry open method...), and just do self serve. Usually if you purchase caviar, they'll get you side condiments (blinis, sour cream, shives, eggs, onions..etc) and keep it in a bag with a ice-cooler device to keep the caviar cold.....

I wouldn't ask the FA to get involved, just bring your little picnic basket of goodies and do it yourself......