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I have been doing this using iOS Shortcuts and a regex for years. Except instead of old I redirect to a redlib instance.

StopTheMadness free iOS browser extension can redirect arbitrary URLs based on regex.

StopTheMadness didn’t fit my needs iirc. I have heard “Redirect Web for Safari” is a decent alternative solution though, have yet to try it

At least it has worked reliably for old.reddit and yt->invidious.