It's not an unreasonable idea. It was done by the Homebrew community on the Game & Watch for example. It would help knowing if the memory is on- or off-chip and what package it uses.
They are constantly changing some stuff on their PCBs, but if we look their website we can see all the elements inside, and I can recognize STM Microcontroller and ST31H320 secure element, but I am not sure about memory.I am not familiar with other components on the board, but maybe memory that is used is from secure element, ST31H320 has up to 320 Kbytes of secure, high-density User Flash memory.
Nano X is using different model of secure element ST33J2M0 that has up to 2048 Kbytes of User Flash memory.
https://support.ledger.com/hc/en-us/articles/4404382029329-Check-hardware-integrity?support=true