I came across extra short 1/4" driver bits. They are from Snap On. And they have a set of them available. I got a T15 just to try out. Fits into the Wera Mini Zyklop perfectly (actually snaps in place). Some of the bits in the set have a higher shoulder so I am not sure all of them will lock into the Wera. Total height in the Wera is 11/16" compared to a 1" bit at 1 1/16". See pictures for comparison to 1" bits. And also shaves a little off the right angle if you need just a bit more room to fit somewhere.
Link to Snap On page
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Seth
Link to Snap On page
[attachimg=1] [attachimg=2] [attachimg=3] [attachimg=4] [attachimg=5]
Seth