I shall forward your challenge to the said Mr Perrier, and confirm on his behalf whenever I have the information, for our presence in the fair city of Vienna is not certain (though it is most likely).
In the meantime, rest assured that I, Fabrice Cognot, the Lion of Dijon, most hapily and liberally accept your challenge, and agree on the time and place - let it be known however that, should the protections available to me at the said time (be them mine or provided by a friendly soul) be proven unsufficient, the fight would have to be postponed, for the preservation of our mutual safeties.
I shall nonetheless spare no effort to be there in the said place and time, with good spiritual armour protecting my undying soul and physical armour protecting my corporeal body, to fight with the most honourable of all weapons the poll-axe, in a timid attempt to emulate the past and unparallelled prowess and greatness of my Burgundian predecessors in this test of skill, might, and honour.
Yours most sincerely
PS : Prepare the beadcrumbs. This will end in Schnitzel. At least for someone.