You know what, anon.
I'm in the exact same boat as you. The exact same boat.
And to be honest, I've come to the conclusion of what to do in regards to this situation.
Follow your heart, no matter what other people say, no matter what other waifuists say about your choices, be true to your feelings.
The same people trying to force these "rules" down your throat, are the same people who broke rules when they decided to follow the path of waifuism, by bravely freeing themselves of 3D for 2D.
They followed their feelings, but now are pushing theirs on you, they are forgetting that they too broke the rules they were taught.
OP, just by choosing the path of waifuism, you already are breaking a number of rules, the rules of what people expect from you, what society, what society wants from you.
If you look at it from this perspective, you're already breaking rules. If waifuism is indeed to follow your feelings instead of doing what others expect from you, then I see no reason to follow the laws of waifuism.
So don't follow rules, follow your feelings and desires, unless, of course, they tell you to follow the rules.
I wish the best for you, your waifu(s) and your relationship. Cheers.