That would be nice, but the maximum capital loss you can use is $3,000, even for an AMT adjusted cost basis for the qualifying sale of stock from previously (prior years) exercised ISOs.
So even if you lost $100k in the sale, according to your AMT's cost basis (FMV at date of exercise), you AMT capital gain for this year is only -$3k. So you won't recover much of your credit this way.
However, you've likely made large capital gains on the sale in your normal tax's cost basis (Strike price), so the difference between that and -3k will get you at least some of your AMT credit back.
