@StrangeTech I would think that could be an appropriate way to do it - but I don’t have much view on how best to implement it technically. But for a non technical user, it will probably be much easier to just flip a button, rather than having to install an “enhanced Cwicly starter child theme”.
Especially when even the very simple child theme, consisting just of basic style.css, functions.php and screenshot.png files, are still not available under the account page. It was promised back in December: Cwicly.com dashboard - Add child theme & make links obvious