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I agree it is.
Look out for @Maal's new mod that has just had a trial version released: It features a brand new duel engine, and in the future when it is stable I hope CK2+ just replaces the old version with the new one. Right now it's not fully compatible with CK2+ though, keep that in mind.
Until then, as @Leri_weill said, don't lead armies - being able to duel is one of the primary reasons to do it, and if you don't want that you don't really have a reason to risk your character's life anyway.
 
valid concern and others have already said their advice, but as someone currently finishing a vanilla game....i miss duels so much ;_;

c;kPlus just seems to have more to do, duels were a welcome distraction and motivator during long slogs of wartime.