Alright, I got an OCD moment because I come back to this post every 6 months checking in if it’s been done so I wanted to give it a go.
I’m 99% there with only filters: https://gist.github.com/davidwebca/efe3bb9f69df0a0f007179c59872054a
With that, it works on full reload of the page in the admin, but not with changes, style changes or AJAX re-rendering… And you have to visit a Gutenberg page to activate the block styles cache, otherwise there’s no way WordPress knows about the block styles registered (🙄).
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