Oh for fuck sake, this must be a major pain in the tits for you. If you're up for one more driver try there was one posted on plebbit at the start of the year. Version 4.36.5-612https://www.reddit.com/r/Focusrite/comments/e42nl1/where_can_i_find_older_drivers_for_my_scarlett/
Now, if you have no luck with that, then what you posted earlier in >>96420137
might still yield a solution, if a little janky one.
Install the Focusrite drivers, but *never* use them with Ableton. If the Focusrite ASIO driver, once it has run once, fucks up ASIO4All then don't run it, just use ASIO4All and the version of the Focusrite software that gives you the best latency performance.
You'll probably need to set Ableton to use your built-in audio device before you start the installs so that Ableton doesn't automatically select and run the Focusrite ASIO driver the first time you open the program after installing them, but if ASIO4All is really your best lowest latency option you should try and see if it will work consistently if you install but never choose the Focusrite driver.