Hi Sean,
First let me say Welcome!
I believe we are talking about breaking in a new pipe, and how to go about that?
You don’t need to put anything in it to help with breaking in a new pipe, just load it with tabac and smoke.
As mentioned, everyone has their own rituals/methods.
Pipe costs, how expensive, and dedicating pipes to single blends are considerations.
Meaning, it might not be enjoyable spending hundreds on a pipe, and then ghosting it really bad with Aromatics as an example, and then later wanting to smoke only VA blends in it.
So, as an example, on decent pipes, to build a decent carbon build in the chamber, smoking only VAs in new pipes is pretty common for a lot of smokers to accomplish this.
If you care about keeping the pipe in decent condition and not letting the cake build up in the chamber get out of hand, use like a paper towel when you are done smoking to wipe the chamber out, this way, you’ll only ever build up maybe a millimeter or less carbon inside it.