On: Show HN: Arxiv Vanity – Read academic papers from Arxiv as responsive web pages

[KGIII]

Have you seen pandoc? That should be able to do that and the comments about results are usually positive.

https://pandoc.org/epub.html

One final thing, and wildly off topic, is that when you do your defense, remember that you probably know more about the specifics of the subject than anyone else in the room. Many folks stress over it, but you're almost certainly going to be the actual expert in the room. Good luck!