Macyrose,
First of all, hi SoCal neighbor! I sure don't know what's going on in your fiancee's mind, and I won't speculate. Based on my own prognosticatory powers, I wouldn't advise anyone to work off of speculations about what anyone else might be thinking. That said, the conditional aspect of asking to wait until after, or such and so... relies upon some hypothetical result that may or may not ever be met. I don't think that the wedding is more important than the truth, and if I was asked to do this, I'd have to think long and hard about whether to take that leap. I want to say that I wouldn't do it, but I know myself well enough to know that I'm often willing to make those kinds of sacrifices, and they're not always good choices.
I don't envy you this choice, and I've now lived the realities of both good marriages and bad marriages. Marriages conditional upon some other thing just seem to be getting off on the wrong foot. I wonder how your partner would take an ultimatum from you? Not to suggest that you offer one, but something to think about. It does make me think about the photos, too. What's it going to be like looking back at those photos of you, inauthentic in your wedding garb. Are you (both) going to want to hang those photos up and think back to that happy day? Will they one day become another kind of bargaining chip, or something to point at and reminisce over or to regret? These are totally just hypothetical thoughts, not predictions, but it may be worth thinking about how this path leads to happiness. I do think that postponing the whole thing may be another "good" option. Now that I've had two weddings, I discovered that some of the things I did in my first wedding were things I thought that one simply had to do. My second wedding was much more about what we wanted, not what we were obligated to do under some social contract. While I don't regret the first one, I did realize that we had always had complete control, and could have done it any way that we wanted. You can do that too. You can have exactly the wedding you want. Maybe it's this one, or maybe it's not. And maybe you won't know for sure until after.
I hope you make the right choice for you, and I hope it gives a result that you're satisfied with and happy with. Unfortunately, those are not always the same thing. I'm hoping and praying for you both, that you both get exactly what you want, or what you can both live with. Thanks for sharing with us here. I know it's hard, I can't even imagine how it feels for you. But my thoughts and prayers include you now. You seem like a sweet, lovely person who certainly deserves to be happy.
Erin