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This looks great, I think something like this can really take off when it comes with a few best practice predefined setups and instructions that handle 95% of situations.

E.g. The family setup:
X keys, give 2 to siblings, 1 to parent, 1 to C, etc...

The business setup:
X keys, key A for co-founder, B for.. C for...

The corporate setup:
etc...