Note: This solution requires ownership of a courtier with exquisite manners who may be commanded to do your bidding:
The Bishop of Verona, the Italian work [Galateo by Della Casa] relates, one day receives a visit from a Duke Richard. [Richard] appears to the Bishop and his Court as "gentilisssime vavaliere e di belissime maniere." The host notes in his guest a single fault. But he says nothing. On the Duke’s departure the Bishop sends a man of his court, Galateo, to accompany him. Galateo has particularly good manners, acquired at the courts of the great: "molto havea de’ suoi di usato alle corti de’ gran Signori." This is explicitly emphasized.
This Galateo therefore accompanies Duke Richard part of the way, and says the following to him before taking his leave: His master, the Bishop, would like to make the Duke a parting gift. The Bishop has never in his life seen a nobleman with better manners than the Duke. He has discovered in him only a single fault — he smacks his lips too loudly when eating, so making a noise that is unpleasant for others to hear. To inform him of this is the Bishop’s parting gift, which he begs will not be ill-received.
[Norbert Elias, The Civilizing Process, p.65 (1994, E. Jephcott, Trans.)]