I haven't tried this with aluminium, but would expect to heat through (you won't get anywhere near orange heat) hold it at temp then cool steadily, I am sceptical that you could heat this enough in a domestic oven but it could be worth having a go at, put the case into cold oven, turn onto maximum, leave it there for perhaps an hour then turn the oven down by perhaps 50 degrees for 30 - 60 minutes or so at a time until it is cool enough to handle. I would expect the sort of aluminium we deal with to harden up again slightly over the following days.
Before pressing the case again I would take a block of hardwood and grind a nice smooth recess the shape of the outer case to support the case while it is being pressed and hopefully reduce the risk of putting a bulge or cracking. I suspect that "hammering" from the inside will work harden the aluminium and encourage it to crack again.
DON'T take my word for this I am not an expert, but it if was mine I would have a go (I wouldn't take it on as a chargeable job for someone else though!!)
Best of luck and let us know how you get on.
ps. if it all goes t*ts up you can usually find outer cases for sale on ebay!!
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