Commander;
I’m afraid I have to point out the obvious flaw in your challenge: If Bataav considers you to be dishonorable and dishonest, then there is no dishonor for him to refuse your challenge, just as there would be no dishonor in you ignoring a challenge put forth by someone you consider to have no honor.
Is there some other way you could engage with him that doesn’t depend on him believing you to be honorable?