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I'd look into the file "battlefield_duel_single_combat.txt" and compare it with vanilla files "single_combat.txt" in Notepad++ to see if there is any difference (other than the changed event names)
Maybe similar case to the Adventurers update where all you need is to add government type flag so landless players can duel
Again please backup the modfiles elsewhere if you'd like to continue playing in previous version
(Directory: (Steam folder)\steamapps\workshop\content\1158310\2749369153)
sommething like battlefield_duel.001
Please be aware that changing the rate will disturb the sequence of duel events