I don't know how much times a flash memory can be
written. It might be OK
to
make a bootable device from it.
My concern is about how to make replacement RL02, RD53 or similar. Flash
memory might not be good for this purpose.
Something from 100.000 to 1.000.000 writes. Maybe battery-backed SRAM or
the newer FRAM battery-less chips fits the bill.
Greetings from Brazil
Alexandre Souza
www.tabajara-labs.com.br