@FlyingWolf
I actually think I understood your question perfectly well.
If one of you is ‘the nice cop’ and the other one the bad one, then from your children’s point of view you are not aligned.
(My wife and I will standard ask ‘what did your mama say?’ (Or daddy, if so applicable.))
If you are aligned as you say and this is therefor a deliberate game, I suggest you reconsider. You risk alienating your child from one of you. On top, it doesn’t feel too good with me to play such a kind of game with them.
I must admit I admire your consciously thinking about this approach and asking for advice. I always tried to be open for other people’s experience based advice. Raising children comes with a lot of uncertainty, no manuals and a lot of contradicting advice.
Follow your heart in sincerity and don’t trust too much on anybody (including me and you) that thinks to know the perfect approach.
And sorry if my previous reply seemed unfriendly; I had no bad intentions. Just writing too quickly for nuance.