If you DO bring the Lev HaIvri, quote his opinion on bringing Karbonos beZman haze, and how everyone opposed him in that regard.
The Kuzari died before Yiddish even existed, and if you read Chasam Sofer’s (and R’Akiva Eiger’s, for that matter) michtovim, you will see GERMAN, not Yiddish.