I don't think there is any universally perfect solution. We all try and give the best. While I don't understand everything that OP is trying to do but I feel that he is trying something on top of the existing options we have. Every good initiative worth trying.



I was looking at the differences. These comparisons between a software run device and a piece of metal is actually not relevant at all.

A metal really does not need to have encrypted. With a cleaver combination someone easily can hide some information which even if it ends up to the wrong guy still they can not get the idea of what was there.
In a metal sheet it's obviously does not make sense to have password.
Well nothing has forever warranty or guarantee
Open source of course nothing to do with a piece of metal.