Is this aluminium rim saveable?
Result DISMAL FAILURE

I attempted to use a large 12" adjustable spanner to gently tweak the rim back to place.  On the first pass along it worked okay, and took out about a third of the offset.  It was better but not right.

On the second pass along I felt something crunch.  It felt like snapping a thin green twig where the fibres break but don't part.  This damage is visible on the left side of this photo.  The pressure was no higher than elsewhere, and there was no warning, just a sudden crunch.



Its fairly evident that the rim flange has folded along the weakened line and its now utterly scrap.

Out of interest I gave the other end of the damaged area a good heave and it took about half the elbow effort that the undamaged part required for a similar effect.   (bend on undamaged rim is out of shot sorry)



I have salvaged the hub and spokes, tyre tube and tape to rebuild on an undamaged fresh rim, which is why its a bare rim in these photos.

tl;dr aluminium bike parts with visible cracking are utterly unserviceable and unrepairable.  Don't waste your time trying to fix bent aluminium parts.

Do recycle them though - Aluminium is infinitely reusable.