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My emergency wallet card also links to a web site with more details (e.g. recent photo of family)

Consider adding a QR code for that link.

Very nice idea to both save real estate and obfuscate URLs - I might steal it :)

I insist! Keep in mind permanence of the data (static vs dynamic QR codes). A QR code can store about 3kb worth of data (or ~4300 alphanumeric characters).

https://superuser.com/questions/1420058/how-does-a-dynamic-q...

https://stackoverflow.com/questions/11065415/how-much-data-i...

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