Wow this is awesome. As someone with a vision impairment, who relies on a screen reader, I want to thank you for taking on this initiative.
I particularly would like to see this implemented:
"Proper buttons, they are harder to style, but they are better semantically, examples are the upvote button"
This would mean a world of difference for me, as currently I can't access the upvote button when navigating Steemit with my phone.

Let me know if there's anything I can assist with in the future. I'm happy to do any testing if you need it.

Jimmy