But if I were doing it, it occurs to me to go back to the first season, when Dany was still with Drago. I'd have one the women from that tribe who may have slept with Drago, approach Dany and challenge her for her position as the queen. Then, I'd have Drago say that they must fight and this is a test for Dany to show her loyalty to him. He'd say no weapons and that they wouldn't be fighting to the death, but until one submitted to the other.
There are five, more obvious fights I'd consider, but that would be more spoilers.