I use a self hosted instance of RSSHub Twitter's search operators are also very useful.
I use it follow specific accounts & search terms.
I'm not 100% sure how your idea would work. I'd look into filtering to links posted though.
That's not what it is doing.
What it offers: Look here for a website you are reading, e.g. Twitter, and create an RSS-feed of someone's user account. Or keyword search: https://docs.rsshub.app/en/
Would you be open to using a public instance of RSS Bridge?
I also use RSSHub on Heroku, but I haven't tried the social media feeds.
When standard methods like adding /rss or /rss.xml to URL don't work I check this:
There are some ways to create custom feeds for sites that don't provide them on their own but I'm not very familiar with those. See https://docs.rsshub.app/en/ for example.
Twitter shut down the old web interface and broke a lot of rss sites. If you want one that still opens to twitter and not a separate site, try rsshub.app or an RSS-Bridge public host - both were working for me as of today.