When we're together, everything is good. Trust me, I too tried to make it work with my very Mormon also returned missionary ex-girlfriend. I haven't read every post like you probably havebut I've read a lot of them. I am a soon-to-be Surgeon's wife and my boyfriend and I have started discussing the changes that are going to happen when he enters his residency. My wife chose me, but most people aren't so lucky. If so, you have a chance. The best advice I can give is stay true to yourself. Through this, if you run into unforeseen issues like sold out movies or you cannot get a seat at a restaurant, you will always have a backup plan. Of course I feel slighted at times, but I check myself and remember that my SO is doing his best given all his demands.
Will people have feelings about your interfaith marriage. His single doctor friends have so much more time and money to spend on lavish overseas holidays and recreational activities, while every spare moment the husband has to spend at home, helping with the children and all the responsibilities that entails. I've never understood that bit of the LDS culture. I married a person, not a religion. I can understand his desire to spend time together to reconnect, but right now it really isn't there. We've been dating two plus years, and we find a key is taking vacations. I work in a different industry and have worked away from home my fair share. I wanted very much to make it work with us, and was willing to compromise in areas that I normally wouldn't. There are other ways.
The Mormon girl has the light of Christ shining through her, and you were drawn in. The goal of dating at that age is to broaden your social circle and learn more about yourself. They could fill a book, the stories I could tell. Would she want you to attend church with her. Why would you behave any different now.
Harmony will prevail if the husband appreciates the value of church service and attendance. It would likely be seen as a trial in her life. A shitty sex life, potentially. She wants the captain of a ship who can direct all aspects of a relationship, including spiritual direction.