While security does not rely on simplicity, a simple system is much easier to reason about security. What you add is a whole stack of complexity through multiple hashes, entropy generation (on your end), and network transport (TLS).

There's no way you could convince me to use your system over a basic KDF implementation. The only people you're going to convince to use this protocol is someone who doesn't have experience in the field, which is why I'd consider your solution snake oil.