I do admire that you are asking questions instead of diving headlong into this project and probably ruining your guns value, at least.
And I know that most of what I'm telling you is not what you want to hear. Unfortunately, it's the truth.
And "degrease, blast, paint, and bake" is a gross oversimplification of the process of properly applying the gun paints.
It's like saying "sand your car and spray paint on it." It doesn't work that simply. Of the gun paints, Ceracoat seems to be the best.
I don't recommend the local bumper plating shop, either. You need someone who specializes in guns, even to plate small parts.
And, most places that professionally apply gun paints will charge as much as a gun plater or even the Ion Bond stuff.
Frustrating, isn't it?