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The Hosco Guitar Cube will do it...
https://www.gluedtomusic.com/products/190/hosco-guitar-nut-cube
Or you can make a very thin spanner from some thin metal sheet that will be enough to work. Use a piece of thin card or paper as well so you don't scratch the control plate.
WD-40 is not the worst thing you could use but it's unlikely to be effective. To stand any chance you would really need penetrating oil, but the chances are even that won't work in my experience.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I have a driver with a right angled handle grip that takes small sized bits and can usually pry them loose with considerable effort (and swearing)
Can you guess how I know this?
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I find a bit of sudden jerking clockwise and and anti-clockwise followed by a big twist normal loosens it.
Oh, and triflow really does help (unlike WD40)
Think positive. At least your flesh prevented any damage to the guitar under repair.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
WD40 is a water dispersant. Any rust cracking effects are purely coincidental.
Penetrating oil is used in numerous mechanical engineering applications. It is excellent on big items such as flange bolts. Grub screws of 1/16th" diameter may not present enough surface area for the oil to get between the fused metal surfaces.
The defeat still bothers me.
I have a cross shaped scar on my left hand index finger pad caused by sticking a pozi-drive screwdriver through it trying to get a (different) fixing undone... the afternoon before a festival gig... that was a painful one.
All I can add to this in terms of advice is sometimes tightening them first breaks any rust/grot build up. Another trick is to get a high powered soldering iron - modify the tip into a screwdriver tip (a file/linisher/grinder helps) and heat the screw up. The heat can break the seal - but be wary of damaging the pot. I had to do this on some equipment that had threadlock applied to some of the screws (for touring, stopping stuff from coming loose) but sadly they hadn't checked the label on the bottle... as some threadlock is permanent stuff. This was a bitch of a job...
Minimal risk to your fingers and guitar finish.
Nil Satis Nisi Optimum