For my Stroud Voices collection I prefer the HTML/webpage format, because I give the collection (including JavaScript) to museums & "Gloucestershire Archives" as a package on DVD-data disks. The advantage is that the set is identical to my web pages.

Doing the presentation as a collection of HTML pages is not a bad idea. If you already do web pages it is a doddle. That way linking to actual websites is also available & straightforward. And it avoids any Apple shenanigans, they always do minutia differently with Office products. I have found, as rare as it is, even Micro$oft is not always compatible with Micro$oft! And you only find out at the last minute, or when giving the package to others.

One HTML page per slide with a list of links on the main page and two links on each page called "forward" and "back". And surely Mo the Caller has a website? If not, and you are going to learn a methodology - webpage construction is arguably simpler and of more general use.