Marriage is not easy, you stand together and build a life together. You need to take a step back, you have seen how non believers are sidelined and undermined. The pressure to conform and the all or nothing that is demanded from the organisation. Even in your post you talk about the compromise you are considering, whether you could fake it for the rest of your life. The JW issues the ultimatum and you have to decide whether you can conform. Think about it because this is how life with a JW will be, you have to make all the sacrifices and they give you nothing.
At the moment this relationship can not work properly for either of you. You need a woman who loves you for who and what you are and supports your goals and aims. She wants to be a JW despite knowing TTATT, perhaps she doesn't appreciate how harmful the religion is or perhaps she doesn't care but she wants someone who fits in with her religion. You are not that person at the moment and she is not willing to compromise for you.
Take a break from each other and use the time to determine what you want from life. Build the life you want and see if your feelings change. You are exiting a high control group and you need to be sure of your own mental well being and health before starting a relationship with anyone.