I have to be honest, it feels to me that your marraige is rocky even without the WT.
I think you can survive the one in, one out thing, providing there is rock solid love, commitment and TRUST there, ie you can trust her not to rat you to the elders, and that you can talk freely etc.
In my personal experience, although I loved my hubby, we were just friends, cohabiting, there was no passion. Married too young, virginal and had just got used to each other.
I stopped attending meetings, after a relatively short time he left, we just did not have enough love between us to survive it. I have to say.. on the most part, I was relieved.
It's a scary 'world' out there, there are many pickings to be had, but also some people who will use and hurt. At times I've missed the security of my boring marraige and the WT society. But on the most part I'm now very aware of how short life is, and after discovering true love, true passion and true friendship, I'd never go back for anything.
You need to examine yourself closely and ask hard questions. It can work, but you need the commitment, and so does she.
Thinking of you
Poppy