Sorry, I messed up terminology there. My brain read chuckless as keyless chuck, somehow.
I've never seen pin-vice-sized drill bits in a hex mount, though, and I have no info for you on a hex-shank chuck that would handle a bit that small. Sorry.
If you get a chuck that is close to being small enough to hold the bits, taping the shaft of the bit might make it workable, though.
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