I agree that matchmaking could be done a bit better.
But to find a workaround the fact that matchmaking isn’t perfect yet is not the way to go.
If the matchmaking is the real issue you have with the tournament then the request should be to improve matchmaking. Not to add another feature to ‘solve’ this problem.
I have had matches that would have been easy wins (4* hero’s vs a team of mixed 3 and 4* all not levelled) and due to bad tiles still managed to lose the match. Well yes that happens too… If I would do this fight 100 times, I think I would win 99 times of them.
This tournament it is the other way around.
I have 1 compelete rainbow team in 5* finished hero’s. Meaning when I cannot use 1 color I am forced to use a 4* or not fully levelled 5* to make a complete team. Guess what, all opponents had full levelled 5* teams and most of them are emblemed. I lost 2 so far and those where mostly due to the fact that the boards where not in my favor. With some more luck in boards I could have won those 2 as well.
On the other hand, had some very lucky boards against teams I tought I would never ever stand a chance (double Grave Maker flanking Guin tank).
In raids I would hit re-roll every day when facing this team. Now I won this battle in tournament.
So fix the real issue would be my suggestion and not patch it with something else as a workaround.