Eh most forced alignment changes don't work. The helm works cus it specifically calls out you like your new alignment and such. But otherwise it goes against the alignment rules in many ways since your actions decide the alignment. So being forcibly switched to evil doesn't make you act differently unless specifically called for it. Might take you some time to get back to your old alignment, but yeah.
For something like undead you might have to figure out how to minimize harm done but otherwise... Yeah.
Fortunately forced alignment shifts in pathfinder are rare and high level generally or monster abilities only. There's none of those two spells in it. Closest there is is a couple spells that falsify your aura for awhile.
But yeah. This is the governor.
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