What about a free dodge when you are in your last promo game. Sometimes you have to play with someone that will totally give a free win to enemy. If a possibility of a free dodge when you are 2/2 or 1/1 could be a good idea.
The problem with this is people will just use it for when the matchup is bad for them or they don't like what their team picked.
I've had to dodge three times in as many years - once because something came up that was important, once to queue with friends, and once because there was a blatant troll in champ select.
You don't need a free dodge in promos. The number of times you actually need to dodge is incredibly low.
