The correct answer of course is that the Submit button should be the primary CTA for the form, and it should be styled in a way to make that abundantly clear to the user. The Reset button (which I haven't seen on a modern form in years), if necessary, would be a secondary action and styled as a standard link, ideally beneath the Submit button (and it would require user confirmation).
Doesn't that take the problem back to the spot where we have the header repeated for each cell? In a data attribute instead of a span, which may be cleaner, but still: