I would say this is not a good idea. People with mobility disabilities will find the page combersome to use, maybe even annoying, since you are adding more things to tab through.
NVDA and other screen readers have built in hot keys to allow users to jump to or cycle through the headings. A user can press H to jump to whatever the next heading is, or they can press 1-6, to jump to a specific heading level.
If you still want to do this, you can do:
<h1 tabindex="0">This is a header</h1>