Use Mosfet as a touch switch
Why using a Mosfet while a bunch of MCU has integrated capacitive touch functionality that requires no external components?

Using a MOSFET isn't a good idea, this design will give you reliability issue and is more expensive.
You can protect the gate against ESD to some extent, but that will reduce sensitivity, and your circuit will work differently depending on temperature and humidity, it might work in the summer and stop working altogether in the winter.
MCU with touch capabilities offers a stack that takes care of all this.
Based on your question, you will need an MCU anyway, get one with touch capability.