Welcome Steve! New here too
Your story does not sound wacko at all though, actually it might possibly be a familiar situation for many here! (and not here)
I personally think you making the step and coming to a place like this shows that you have made a step in your own mind, which I think seems important. I'm not quite sure what to tell you about your wife, I think it's pretty cool that she was open to swinging, I think it means a big step for her, however I'm not sure that she will ever be truly poly either, but I would just take it slow now and play it as it goes, I don't have a "next step" for ya though, wish I did. Hope this helps and good luck dude!