There is a tiny driver branded Steinwhale with double-ended bits that are shorter than regular bits. I might get it.
Not a daft question as they will not attach to many bit holders. Wiha who makes these naturally also makes tools that hold these. I suspect a magnetic holder with some depth will also work. I don't know if they have the ratcheting style of tool your prefer. I think I've seen short double ended bits like this from others too, so there might be more sources.As for only imperial the 1/4 inch hex bits standard size is indeed imperial, and I've only seen these for the 1/4" standard. Other double sided bits exists for 4mm hex precision bit standard. I'm not aware of any double sided bits for the 8mm hex bit standard. Leatherman and Nextool (and maybe more) make their own non-standardized flat holder double ended driver bits. (Nice pictures Grand Banana - somehow I've overlooked this until now. Interesting tiny bits!)
[ Quoting of attachment images from other messages is not allowed ] The steinwhale bits do not fit the Leatherman ratchet driver!
I'd say they fit to well...