There's a rope pushing exercise (from my experience anyway)...
I think what you really need to be mindful of is what is really behind the lack of support and how deep that runs. I was married, and when we were young, well before having kids, being married, or even owning our own place, even my tabling of the idea was enough to throw her into fits. I proceeded to marry her anyway, we bought our own house, had kids, the underlying divergence of ideas never went away. Eventually her negativity ate away at the marriage, fear of money (and lack thereof) CONSTANTLY caused problems, and it became more and more clear that in her world there was no place for my big ideas.
Marriage is a partnership. A pretty serious one, one that you don't get to go home to get away from. Listen to a few of Brandon & Josh's podcasts, EVERY time they or their guests talk about partnerships their #1 caveat is to make damn sure you and your partner are on the same page wanting the same things and pulling in the same direction striving for the same goals. At least if a REI partnership goes sideways only one part of your life takes a hit.
You'll have to spend a lot of effort understanding what's really behind the lack of support. Understand her mentality in broad terms to be able to tell if she's able to come around (objectivity is crucial here). Then decide IF there's a way to talk through it, ration through it, tiptoe into it, whatever. That's a big if. You may have to settle for her accepting you doing what you want to do, even though she won't support it. That may be as good as it gets. But if that would also be your opportunity to get into or keep going on this. If it's just not there, you probably already know it. But if she's not actively preventing you from doing it, that's some support of you all the same.
You "just" have to have the ability to objectively assess what's really what then devise and implement a plan to achieve what you're after, if there is such a plan possible. And if there's not....
Well, I'm not married anymore (if that wasn't apparent already). And 3 years after crawling out of the ashes of my divorce, having given literally everything we had to her (including all cash savings) so I could walk out "whole" and not pay to her any more of my future $$ than I had to, here I am trying to get started. My first convo's with her about this were in 2004. All that lost time...
Good luck!