no, I think conveying two meanings to a single event is generally an anti-pattern, and in particular in this case, you might want to repost a highlight but not agree (or perhaps not even see) the `comment` tag; or make your own quote -- what are you quoting now? the original highlight or the `comment` tag?
I just don't see the issue with rendering optimization that is behind the idea of this DIP as compelling enough; clients already need some filtering around how to render events to avoid rendering duplicates.
So highlighter does it in the way it's been getting done: a kind:9802 is for the highlight, and a quote about the highlight is a kind:1 with a q tag of the highlight 🤷♂️