I've tried everything from relying on uBlock Origin's anti-sabotage injections to literally reverse engineering websites and directly using all the internal APIs their own javascripts consume.

My dream was to have a "custom HTTP client" for every website. Instead of one browser for all sites, I write "adapters" for them that scrape the data into my own schemas. Maintaining this was far too much work back then, but now that I've got AI... I think I might try it.