While I enjoy the creative ways of generating a private key, and have seen many other creative approaches to security out there, I would discourage people from using any of them. There are so many ways to get it wrong.

Security professionals understand the issues involved, think about them every day and keep up to date with information on which security solutions have been compromised and which have held. In almost all situations, people are better off using industry standard security solutions which have been tested with millions of people. Currently, hardware wallets are considered the best available solution for generating and storing a private key. People who want peace of mind can utilize this solution and try to read up on how hardware wallets, private keys and blockchain technology work, in order to have a better understanding of the workings of the whole system, and hence to know how to protect themselves better.

Unfortunately, to my knowledge, there is no hardware wallet solution for generating and storing your Steem private key, so that remains as one of the big and important security problems for the ecosystem.