STM32N657L0H3Q power architecture

[foc]

Hello ST team,
I am designing a circuit using the STM32N657 and want to minimise the total power consumption in this application. therefore, I am considering using the ultra-low-power U031 MCU to switch the STM32N6 on and off via this MCU. My question is: can I use a power switch instead of an LDO?
I have attached my power tree I’d appreciate it if you could have a look.

Regards