I share your pain. I wrote about my solution at Saving tweets into DTTG via iOS, and my current AppleScript code can be found at https://github.com/mhucka/devonthink-hacks/tree/master/auto-convert-web-page-to-PDF
It’s not perfect, but it works for individual tweets (at least in my environment).
For tweet threads, I pay for https://threadreaderapp.com – it’s cheap, and it is hands-down the best Twitter saving tool I have found.