To some extent a keyless chuck is self-tightening. You can insert the drill bit, and snug it up with your hand, not super tight. Then, in use, the mechanics/design of the chuck tend to tighten the chuck, increasing the grip on the bit, stopping it slipping.
That can mean that the force your hand needs to use to tighten the bit is less than the force needed to remove the bit after use. Hence, for undoing only, some mechnical means can be helpful.
The two holes in the one you show are designed for a pin spanner.
The point made above is a good one: loosening a keyless chuck is a two-handed operation. If you do not want the drill bit to fall on the floor, it needs three hands.
Another option might be a standard keyed chuck and get someone to modify the chuck key to a form that enables you to use it (e.g. add a 1/4" hex shank to it so you can use in a cordless impact driver).
Drill bits are widely available with hexagon shanks to fit a quick-change holder. For smaller sizes, that might be an opton if you do not mind sacrificing a little precision.
You can stab a plain shank drill bit into a piece of foam to hold it, which then frees up both hands to operate the chuck. A test tube clamp or giant clothes peg could be used as a third hand to hold the drill bit.
