Impossible without centralizing the conversion between user + password into the private key.

Just to give you an idea, without centralizing it, the "e-mail" would have to use 22 words to represent it. It would be VERY long.

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No. Use same logaritm as brain wallets use. Example: https://brainwalletx.github.io/

There is no lower or upper limit to create a private/public key. You can create a key pair using a single space even.

Also, you could support this in Amethyst alone and let the user see/get his private key after login, to be used in other clients.