Putting a bit of weight behind it? Your poor bikes. Apparently grinding off the tip of a regular Phillips gets you almost JIS so you might be onto something there. I think that’s what Park’s regular screw drivers are in effect.
I guess I ruined enough bolt/screw heads as a younger me that I'm pretty good at knowing when something's about to let go and risk rounding out so I tend not to ruin much these days.
Fuckin' "standards" again.
DIY JIS = Philips with a fat hippy behind it.