I’m speaking at a conference at 7 am tomorrow, and I didn’t even remember the topic of the talk (or whether it’s on Spain or Central America) until two minutes ago.
I don’t write “conference talks” and I don’t recommend people do it at all, especially if they don’t have a million publications. Write articles, submit them for publication, and then you’ll be able to cull any number of talks out of texts that will be already written and a lot less tentative and confusing than whatever you write purposefully as “a conference talk.”
The genre of “conference talk” in the Humanities should die a painful death as soon as possible. We end up with crowds of people who have dozens of these “talks” that never turned into actual research.