This sounds like a terrible idea. Similarly to implementing your own encryption, having a custom consensus algorithm can create additional vulnerabilities -- a

This sounds like a terrible idea. Similarly to implementing your own encryption, having a custom consensus algorithm can create additional vulnerabilities -- a custom consensus algorithm isn't as tested and vetted as an existing, widely-used one. In security, you generally don't want "unique and innovative", you want tested, verified, robust algorithms that have been gone over with a fine-toothed comb.