I wouldn't recommend you doing that. Brain wallets can be very insecure and could put your coins in danger.
Yesterday, I answered a guy that was claiming losing 1
BTC with his Brain wallet after someone probably cracked the seed he created. Here is my answer:
Many thanks for your warning.
I was just thinking about that, because, when I choose a seed and then import in wrong order, what would happen? Would I accidentally import the wrong bitcoin adress?
I need a mindwallet. Isn't there a more secure way to generate? Or I could just choose a paper wallet and memorize the private key somehow?