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You going to be doing a bunch of these, or just one? If the tool width is 1/8", you could slot it, and use a piece of keystock, or if it needs to be longer, a piece of 1/8" plate sawn and filed to shape, and sweated or riveted in place. If you're doing a lot of them, spending more time making the correct tools makes a lot of sense. If it's a one off, you could just make a brass hollow-ground screwdriver, ground or milled to fit the slot you need to engage.

MIght also look at Wheeler gunsmithing tools: https://www.wheelertools.com/gunsmithing-tools/wrenches-and-screwdrivers/space-saver-screwdriver-set/664507.html#start=1 modifying one of the bits in the kit I linked might do what you need to do. I have that set, and a FAT Wrench (torque screwdriver) with a larger hollow ground insert: https://www.wheelertools.com/gunsmithing-tools/wrenches-and-screwdrivers/f.a.t.-wrench-with-10-bit-set/553556.html#start=1

Or you might want to check with the Chapman Tool Co. https://chapmanmfg.com/collections/individual-parts/products/slotted-insert-bits They have just about any bit you could imagine...

There are probably lots of ways to skin that particular cat.

Bill in OKC

William R. Meyers, MSgt, USAF(Ret.)

A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
LAZARUS LONG (Robert A. Heinlein)