Your text on bastards is all over the place, but whatever, it's not that crucial to the original argument.
So, assuming most unmarried women were childless does not in any way indicate that all of them were "saving themselves for the perfect man". Instead, your sources mention economical problems women struggled with that prevented them from marrying, which is understandable, since for a woman dowry means financial security.
After excluding nuns and prostitutes, I tried looking for data on spinsters, but this term doesn't only describe women with unrealistic partner requirements. Honestly, it's pretty much impossible to determine the percentage of this incel targeted group.
What I learnt from this exchange though, is that incels have a delusion of women ending the entire human race if left completely alone, which shows how much dehumanized women are in their head. It's hilarious considering that at the same time they're upset women also don't think of them as human beings according to their rhetoric.
Yeah, your definition of female hypergamy is a non-issue.