So what's the compromise? Youv'e got to get creative. I have a feeling that once you have the compromise in place and you get the time alone that you need, you will need less of it. IN other words, once you feel you can have it when you need it, you won't need it as much.
What kind of living situation do you have now? I know some couples who buy or rent a house with two apartments and they each live in one. Or one couple had a duplex, side by side houses.
Your wife is going to be sad. This is going to rock her world. IN a bad way
But it all depends on how you go about it. If you are 100% SURE that this is not a tricky way for you to dump her - slowly and painfully and without telling her the truth - then you should be able to declare your undying love for her while you ask for this compromise.
I suggest you two get into counseling and start to work on these things. If you want this to work, and you want your marriage to last, then you will need to really be there for her during this. Becuase she will feel you are breaking away from her and that is terrible to endure. She may dump you because she feels she can't trust you anymore, or feels that you're not really committed anymore. If you want her to stay around, you will have to work hard to get it while you ask for this huge thing from her. This is not what she signed up for; you want to change the rules 6 years into the game. It can be done, but it takes great sensitivity and patience and responsibility on your part.