Extracting new message content from the API (existing solutions?)

Setup: I sync messages from the Core API and process them downstream. For that I need just the new content of each message, not the quoted thread history, signatures or disclaimers.

What the API gives me:
- `body` - full HTML, including everything
- `text` - plaintext rendering, also including everything
- `blurb` - quote-free, but truncated, so usable as a signal at best

So I'm parsing the HTML myself, and running into the usual wall: no standard for marking quoted content, every client does it differently, unclosed tags, tables used for layout. Forwards are the worst case, some clients wrap the entire forwarded message in a single blockquote, so naive stripping leaves an empty body.

Front clearly handles this internally (collapsed quotes in the UI, the `front-quoted` class, rules that skip quoted text when matching conditions).

1. Is that exposed anywhere I've overlooked, an endpoint, field, parameter, or a paid add-on? Happy to pay for it.
2. If not, what are you all using? Interested in what holds up on real volume, and whether anyone has solved this for non-English mail (Dutch, in my case).

Any pointers appreciated.