Although the super glue speaker "repair" was good enough at the time, and even though I've effectively retired this macbook since then, a pair of third-party speakers from AliExpress was <10€ shipped and I couldn't resist giving it a go.
Maybe the originals sounded a bit deeper — can't really compare them now — but the replacements sound quite nice on their own. I'm surprised.
Now I have a bit more incentive to repurpose this laptop as a Linux machine.