Ok, the MOSFET being back-driven isn't an issue for the MOSFET, because Vgs would be ~ -0.7 (negative 0.7), which won't allow anything back into the PSU that's off.
However...
My 1163 gate driver can handle the voltage applied to its output pin, because it's got a 14v zener there, internally. The 1154 however does not have that internal diode. Effect? I still dunno:shrug:
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