Drivers tend to be standard shank sizes, so you can always just take a block of scrap hardwood over to the drill press and pump it full of holes of the appropriate size. All of my impact-ready drill bits also live in a piece of scrap.

Some impact drivers work with insert bits, but many require power bit-style bit holders or extensions. There's also of course the option to use longer impact-rated screwdriver bits that don't require the use of a bit holder or extension.

A spin-off of this is a bit sleeve, or a drive guide. This is basically the same as a bit holder, but with one added feature: a retractable sleeve. The sleeve is there to slide around your screw, once it's seated in the driver bit to keep it from wobbling or slipping out of the bit while you're securing the screw.