Akiri was up there in choice as it does give red and white for things like FoD and dragon master outcast. But with rule 0 break, I was considering more like thrasios/akiri. Something like that for color diversity.
I don't think Rule 0 is intended for breaking the rules of deck building. Commander is a format built around those, if you break those rules you are no longer playing Commander, which I guess is fine. In my mind, it would be like our group saying we are using Rule 0 to move from a singleton to doubleton format, it might be fun, but it is no longer Commander.
Rule 0, I believe, is intended to talk about game experience, like power level, or competitive nature, or mulligan rules, or using a silver border or banned commander, or discussions about levels of counter magic or interaction or combos, or the ideas of stax or land destruction, or proxy use, or even game length. Most of these things have nothing to do with the actual "rules" of the game.
I think there are things that Rule 0 is not intended for, like undermining the format rules. I don't think Rule 0 should be used to break the rules of the format, and for commander the format is almost entirely about deck-building rules.
I am not sure if this matters to what is going on here or that your group would even care, but that's my two cents.