The short answer is that you can’t.
Thanks, that’s exactly the kind of encouragement I needed. 😉
As it turns out, tables can be transformed to have vertical headings using some CSS trickery, as this minimal example proves.
This is what I got the repeater field to look like using 35 lines of CSS:
functions.php). There’s undoubtedly room for improvement, but it seems to work quite well so far.
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