This design has a MOSFET used 'backwards', and I don't see the point of having a second 'forward' MOSFET in series with it.
I don't see any point to the 50 Ohm resistor. It will slow the speed with which power 'comes up' at power up. But, is there a benefit to that?
Once the 'forward' MOSFET is gotten rid of, the zener protection needs to be from gate to source of the 'backwards' MOSFET.
Edit: punctuation
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