That's a lot of work for I don't know how much gain. And, more importantly, I have to agree with a number of posters here that page (and anything like it) is an accessibility nightmare.
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(I've read a bunch about accessibility, but I'm no expert).
I don't know, I actually think this blog is more accessible than most.
You might have missed the transcript link at the bottom.
The only changes I'd make is adding a summary alt to the image saying something like "The handwritten body of the blog post. A transcript is linked below".
(Without any alt the page might be confusingly blank, but as many screen readers poorly support long alt text you don't want to copy the transcript in.)
edit: Yes, it works okayish in screen readers. Accessibility is about far more than screen readers.
May I ask, what other accessibility conditions do you feel this site doesn't meet?
Also - for a non corporate website - why should accessibility be a relevant factor? For a personal project, I don't see why anyone has to make it targeted for every case.