Sometimes I actually do a slightly similar one. I do 3. 2. 1. 4.

I also sometimes skip point 2. to avoid any bias and follow their own pitfalls instead using my own creativity from the raw material of point 3.

But your workflow is great. :) It's the same than Apple or Ford when they created the first cars. Like their famous quote: if Ford asked first to experts what the next transportation will be they would have said faster horses. It had to start from a visionary first and not experts.