Being of sound mind but of no particular authority on the subject, I offer the following argument and opinion:
I suspect the nature of your question is related to the common use of the term "campfire" to describe the assemblage of a pile of wood, arranged intentionally for the purpose of encouraging fire to grow and advance within the confines of the assembled pile. While I too consider it convenient to apply the word campfire to the unlit pile of wood, such conveniences are inaccurate.
The word campfire is defined as "an outdoor (or open air) fire in a camp." The etymology indicates the origin is, simply "camp" + "fire." Using this definition as a basis, I would argue that the unlit tinder, kindling, sticks and logs assembled into a proper form for establishing a camp fire are not a campfire, they are a "framework" or a "build" or, less formally, a "set" from the concept of putting something together with other things. Until the fire is applied to the "build" you do not have a campfire.
The definition as found in the dictionary includes the concept of how the fire is used to differentiate a campfire from some other fire that might exist. Cooking on, and/or congregating around the campfire are conditions which give clarification to what constitutes a campfire. If the term "campfire" is used to name the build of burnable materials, before fire is applied, how would cooking be done, and who would be interested in congregating around the unlit build?
Therefore, it would be illogical to "set fire to a campfire," or "light a campfire," because, in order for it to be a "campfire" it must be burning already.
What is needed to address the dilemma you cite above is a unique, comfortable term to identify an assembly of logs and starter materials, set up for the purpose of establishing a contained fire, in a camp. At present, no such word seems to exist. In it's absence, we are left with cumbersome constructs that are far from elegant or romantic.
"I set fire to the campfire build" may be as accurate as it gets, but I think I would just say, "I started the campfire." and leave the reader to develop whatever conclusions they will from the context of the story.
I don't want to even think about the term "Bonfire" right now.