On Monday, October 23, 2017 at 1:43:52 PM UTC-7, Bob La Londe wrote:
I sometimes find its easiest to grab a chucking reamer to clean up a hole

I would think ideally a 1/4" (6.35mm) capacity keyless chuck on the end of a
middle size screw driver would be ideal for this sort of work. Somebody
must have made one already. Maybe a 3/8 or 1/2 would be handy, but I
usually find myself dealing with this on the smaller bits and reamers.

Yep, that's a useful item, and easily available (or build-able).

https://www.banggood.com/0_8-10mm-Keyless-Drill-Chuck-Converter-14-Inch-Hex-Shank-Adaptor-p-1160824.html?rmmds=search

Works with a variety of handles, including cordless screwdrivers (but you'll
break bits if you use a pistol-grip type and something binds). Cylinder-on-axis handles
work best.