Sorry that you feel like it's a stunt. I can only use what you have said, apply it to myself in what I believe I would do...or have done to try and help you.
I could be totally off base here, but this is my take so far:
You don't like the idea of trying 2-3 times, to get results you want. The insanity thing.
You say you are fine with being married to your wife, you love her, it's just that there is no sex. One day you seem ok with that, the next it seems like a FWB is a-ok.
The FWB? Some sort of agreement with your wife regarding that would kill her...but doing it behind her back wouldn't when she found out?
I cannot tell if you're intentionally being obtuse, here, or if I am just missing something.
In your situation, sex is important to me, I got that impression for you too, however, it also feels like your trying to convince yourself, or us that it is not important to you.
I did not give up talking to my wife about a balance in our lives with sex. I also did not approach it the same same same way, when one way did not work.
If however, I did my best and no compromise was met? As in my wife was not having sex with me no matter what? Yeah...pretty much an ultimatium at that point in time. Loving marriage or not. Though I do view a loving marriage where needs/wants are at least attmepting to be met all around.
Experience is a brutal teacher, but you learn. My God, do you learn. - C.S. Lewis
Life is usually all about how you handle Plan B. - Jack3Beans
Listen without defending; Speak without offending - FaithinAK