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Bottom line: your sprag is less likely to fail if it's a bolt-in. They're not that expensive and there really is no drawback in using one.

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Only half correct , The facory type sprag wit ha bolt in outer race will still fail by having the rollers rollover , the Cona or A+A sprag has more rollers so it is virtually impossible to have the rollers fail.

Just replacing the outer race to a bolt in type on a trans that has not had the outer race spin in the case is a waste of time and money.

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You make a good point about the roller rollover, but even if the outer race has never been spun, installing a bolt-in sprag will still lessen the chance of it ever spinning (the force required would need to be much greater).