If we were local to you, we'd be happy to sit down and talk. Unfortunately, we're over 800 miles aware as the crow flies.
Something to consider (and I agree with where people noted above); it's your wife's sex drive that's intense. So, would you entertain the thought of finding single males? I can tell you from direct experience that sharing your wife with another man in an MFM scenario is a very enjoyable experience (at least for me, but it is so for many other men as well). My wife has had two long term boyfriends over the years, and got great satisfaction from doing so. Based on what little we know so far, it sounds like this sort of scenario might be a good match for the two of you both.
If you're willing to consider the single male approach, let us know. We can give you a lot of advice on how to make that a good or even great experience.