No, that it is way too specific and has no chance of seeing the light of day simply from considering the runes portion. The champion in itself would be given a weighted value based on which one has the higher playrate? +1. And that's it. They are in fact supposed to be separated by playrate, regardless of outside factors. How they are built is entirely up to the players, contingent on what they think will either win or be fun.
It's not something that would see competitive play, but would be a fun game mode unless it received better categorization due to popularity. I do think that if it were a competitive game mode, then you would need to factor in winrate, and in that case you would average out the champion:
E.g. for Malzahar, if he was OU as AP but RU as AD. He would consequently be listed as UU
If Tristana is OU for AD, but has a high winrate as UU AP, then they would both be listed as UU.
In either case you would still receive 3 bans per team, so you could always remove the outliers. Not too many champions have outliers, so I don't see that being an issue.