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It's neither ph1 or ph2, which makes me think it's JIS - which I don't have. I'm not going to turn a socket to try and disassemble a 15-20 yr old part in the hope of fixing it, lol. I took my shot and failed.
Nef-
makes me think it's JIS
It will be.
which I don't have
Craziness. Every one should have a set of JIS screwdrivers in their bike fettling box.
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WD40 for hours then a hairdryer on hot might loosen it up enough to budge.
I’m not sure if it was even bike related, but I remember seeing a riveted or solid piece of a component that looked like it had a pozidrive slot, but it was actually only to keep the part steady or something and it wasn’t an actual bolt.
Brommers
Eseman
Find a thin walled socket or a friend with a lathe (the best kind of friend).
Although it looks like you've been using a mismatched screwdriver. The right size and type and getting it on a bench / in a vice so you can apply a decent amount of downforce might shift it.