Not sure about “smartest” but your approach should be optimised for available tools and materials. Here’s how I’d approach it using stuff I have in the house and the shed.
Fashion a small hardwood block to follow the inside radius of the undamaged corner and to protrude 10-15 mm above the lip of the “bowl” that is the lower case. When the block is flipped over it should match the curve of the damaged corner.
Place the case on something inflexible (like a marble pastry board) and slowly press the wooden block into the bent corner by alternately tensioning a pair of ratchet clamps.
It’s possible that the bent aluminium will resist the clamp compression. If that were to occur, I’d use a pair of G-clamps to press the wooden block into the aluminium, alternately torquing each one down in quarter-turn increments using a suitable lever.
I’ve been thinking about this a lot (Lukas’ photo is not something one can unsee) since I posted the above. It occurs to me that some preparatory steps will be essential:
- an additional block of wood and one or two additional clamps should be used to secure the undamaged portion of the case to the pastry board (or other rigid surface).
- it will also be necessary to use some packing material–like 3mm Masonite–on the underside of the case so that the clamping force is not transferred to the rubber “feet”. The smooth surface of the Masonite should face the aluminium.