This really is a complex one, and nothing we as transwomen can do or say will fully mitigate the risks of some future rejection by a guy.
Suzi, your question is thoughtful, but permit me to recast it a little, if I may...
Most men are fairly traditional in what they want from a partner. Companionship, sex, bragging rights to their friends. You can understand that the disclosure of one's trans status would knock all but a very few who have a more open gender and orientation schema.
But I truly don't believe we are looking for a needle in a haystack here. Many of us in our 30s, 40s, or beyond have exactly the same trouble as our cis sisters. I have a bunch of great girlfriends, smart professional women, all of them, and we are all single. Certainly part of the issue is that the pool of available men is quite small for us, but it's also that a lot of the stuff out there is totally and utterly underwhelming! And we know it.
Another thing I want to add, which is also related to those of us in our 30s and beyond is the nature of love and attraction. Someone once mentioned to me that when you get married before your 30s its for love; afterwards it becomes more of a business relationship. Cynical perhaps, but there is some truth in it.
So, all considered, as a way of dealing with this issue practically, my feeling is that most men I meet won't even get past the first date. A tiny number will reach the second date. I don't want to waste time trying to win over the wrong guy: by date 3 he gets to know the news, and if it's hasta luego I haven't wasted much time. My cis girlfriends do pretty much the same thing.
We should worry less.
Hugs to my dear sisters
Julia