I would wait, personally, or pay for it yourself. I wouldn't recommend getting a surgery you are not comfortable with just so you get coverage. That is not fair to YOU. And I bet you more and more insurances are going to start covering it. I know United Healthcare does, but we have that insurance and for some reason there is an exclusion at my husband's company. So we paid for it. It wouldn't have mattered which procedure I chose, we had to pay. It sucks because we pay a lot for health insurance. So you are not alone.
I have a friend right now in your same situation and she is planning to get the bypass against her better judgement. I am so afraid for her and praying the insurance will cover the sleeve (she is asking at her next appt). But she doesn't have the money to pay.
When in the hospital there was a nurse on my floor that worked for some very famous doctors in Houston. She said a lot of people get the bypass and they don't need it because of your same situation. She says they suffer so much more with the bypass. She was advising me to tell my friend that she doesn't need the bypass b/c she is only 300 lbs. She said it really should be reserved for people 400-600 lbs.
But I think my friend is going to go through with it and I'm scared for her. She is the sole breadwinner at home as her husband passed a few years ago. She has a dependant daughter and grandson. So I am very afraid for her.