Okay, I genuinely thought they were incompatible, but its still a bad idea. 

nerd2ninja

With all due respect, you have no idea what you are talking about. Modern encryption is almost all hybrid methods. Of course it is possible to derive and exchange a symmetric key from any asymmetric key pair for AES or whatever.

zuspotirko

You'd have to memorize a separate seed phrase for your RSA encryption and yet another seed phrase for your PGP. They aren't mathematically compatible with each other.

The software to convert that type of entropy into those items simply isn’t written yet

Jhfryhvffthg

bitcoin

Bitcoin wallets could do so much more

A seed phrase is a word based representation of a number (the private key) of a digital signature algorithm. This algorithm is not good for encrypting messages and would not redeem a PGP key (which is an entirely different algorithm.)