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MOSFET driver with 1MOhm resistor doesn't make sense. Drivers are used to make switching fast. With high power load MOSFET can burn out when it is switched slowly.

Delay should be before the driver.

Hacking without any knowledge of your circuit is impossible. If someone has access to the PCB of your device, and plenty of time to reverse-engineer it, he can hack circuits without microcontrollers too. He can make hardware backdoor for future use, or switch-on solenoid directly.