I'm not quite sure how that would lead to any resolution. She wants total freedom - it's clear she's wanted that since the beginning, since her epiphany, since suggesting the bf/gf experiment and agreeing the ground rules for it.
I'm still on that journey - still moving along a road that could lead me to the same "zen" state, but might not. Don't I have the right to travel that road at a pace of my choosing?
...
I've tried to encourage her to do everything, anything she needs/wants. Never stood in her way. I seriously dont think I could do anymore, short of saying "go and do whatever you please" and then deciding how the hell I find happiness for me and my son.
If this is all true, then there should be no problem. As long as there were an agreed-upon amount of time spend with your son, and an agreed-upon amount of time that the two of you are spending on YOUR relationship, then...what's the problem?
Your wife can have a lot freedom for herself, and go out and do whatever she wants (date multiple guys, have casual sex, whatever), as long as she holds up her obligations to the family.
And you can move slowly, and proceed at a completely different pace in terms of dating/seriousness of partners/how many partners/etc.
Neither of these things are in conflict, unless one (or both) of you believe that the other person should be doing what you're doing. That there must be One True Way or One True Speed to explore poly with.
Now, if she's say, ditching a night where she planned to do a family event with you and your son at the last possible minute so she can go on a date with a rando - that's a problem. But you haven't said that.
You have said she feels resentful towards your son. I have mixed feelings about that - I'm mainly wondering, from what you've described, if she did resent your travel while she stayed home with your son, because being a SAHM while your husband is traveling means that 100% of the time, you're being a mom, unless you live close enough to family or have good enough friends that some would babysit for you. Maybe part of the problem is too many years of what felt like nothing but pure, constant responsibility for her, and now she has this NRE experience with the new guy and is realizing how badly she needs a life outside of motherhood.
Either way, there are a lot of questions here that you're not quite answering. And like I said, you taking it at your pace, and she taking it at hers aren't mutually exclusive - unless you're trying to demand that she slow down to yours. Because that WOULD be standing in the way of her finding her way.