Another option along the same line of thought above...

get a 1/4" to whatever Allen head you have. Very common... HF has a zillion "security set" that would have it.

As above, cut either the 1/4" end, or the Allen end to meet your needs.

Then there should be a good selection of 1/4" wrenches that you could use.

For example, find a 1/4" ratcheting box end wrench. There are some that are offset, some with flex heads.