Yes, it works! Now with improvements, too. I will lead with a blockquote.

So this is what a blockquote looks like. I bet you didn’t know that!

• A list
• with a few;
• items

As it turns out, even a quote can have a bulleted list in it!

And some content… in which I try making a footnote! What’s interesting about this content is that it can be ¹¹ if one would want to, of course amended with content to the side! This is an interesting combination of many lines where alignment is desired big-time, and not a matter to take lightly.

Testing with emphasis on the thing.

(defun tw-footnotes-in-aside (fn-ref contents info)
  "Convert the FN-REF with nil CONTENTS and plist INFO."
  (let
      ((fn-number (org-export-get-footnote-number fn-ref info))
       (fn-text (org-trim (org-export-data
                           (org-export-get-footnote-definition fn-ref info)
                           info))))
    (concat
     (org-html-footnote-reference fn-ref contents info)
     (format "<span class=\"sidenote\"><sup>%s</sup> %s</span>"
             fn-number fn-text))))

And some more stuff after that, of course!

Numbered lists are great.

1. Is the first,
2. is the second, and
3. is the third.

What’s cool about this is that we can ahve tables:

Now with more content! Woop. Do we geet footnotes below this? Better readability now? Maybe this even has a reference? Woo, subtitleee!!