won't just covering half the nut work?

The bolt is too long to get to the nut.

Do you have a picture of the nut? Maybe some ratcheting wrenches.

Any chance you can just wedge something in there and turn the head of the bolt?

Not sure why you need it to be universal. Those things are pretty much only good for a weird-shape nut that's partially rounded and not on very tight. (Read: they really don't have a use)

They do make ratcheting wrenches, or these "universal depth" sockets. Which honestly worked pretty well on a job site once. Carrying 2 dozen wrenches is a pain, so a socket set that can handle a 4' deep all-thread is great.

Pass-thru Socket set

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