Where have you implemented it? I'd like to check that out. I'd prefer to avoid storing anything on the server if possible, but people do need a method which they're kind of used to and email is part of their standard flow.

It's part of something I'm still working on that I haven't released anywhere. I do agree though, there needs to be less friction for people to be able to recover their key which is likely to get lost by many.

I've backed up this next but there's no guarantees. I wish the seed phrase option or something else had been available when I created these keys.

You could definitely build something to shard your keys even after the fact, I imagine creating a seed phrase could be achieved too.