I would love to stay on Superbru 100% as we have always used that format here and in many other pools,except the Euro or World Cups where we have used the UEFA/FIFA one time and then used UEFA/FIFA as a side bet,so you can put that with the odds as an additional prize to play for but not split the prizes,you can give that like 1000 dollars as prize as the guy who makes the most correct predictions wins that side quest prize.
I think this should be much more fair than using a dual system for the main purpose of this pool.Waiting to see how will be the final decision before sending in the fee in the next few days.