ceramic coated headers on break in

They don't recommend it cause it can get hot enough to cook the coating off and not just in spots. And I doubt a fan will help. I don't know a single header manufacturer or ceramic coater who recommends using them for break in.

Break in exhaust temp is WAY above your regular temp. And for over 20 minutes of high RPM (assuming you're breaking in flat tappet) action. Ceramic coated headers need to set the ceramic coat. They do this through heating/cooling cycles. Just like any other annealing process. The heat bonds it. The cooling strengthens it. Skip the cooling and well...

If you wanna try it and risk your however many dollar headers, go for it. I know I wouldn't.