Swinging really can't make up for a lack of sex in my opinion. It takes a lot of time and effort to find the right people and get schedules to match. We're active, we both play, we live in a swinger haven, and I haven't full-swapped in a year! (for various reasons). If I relied on swinging for my sex life I'd be screwed! I also find that when we go out and do swinger stuff it makes me really turned on.
So you may end up going to clubs and then masturbating 5 times a day for the week after.
Your wife should think about finding a Dr who can help resolve the pain she has, they may also be able to help her low libido. Here is a related thread with resources: https://www.swingersboard.com/forums/topic/45970-okay-sex-hurts-pelvic-floor-therapist/
I'd encourage you to improve things at home before looking elsewhere.