This makes little sense, IMO. Information is information. There is no difference between this and just having a short/simple passphrase with the PKBDF iterations turned very high. You might as well shard secrets using Shamir and encode it via a modified version of BIP32 words.

That sounds like a roundabout way of doing security questions... https://security.stackexchange.com/questions/186297/do-secur...

ohhhh that's brutal haha! for context my app runs entirely clientside, but I get it, it's an interesting idea...

That is a neat take on "key strengthening", or "peppering":

https://crypto.stackexchange.com/questions/20578/definition-...