Everyone knows what I'm going to say. Don't use a reamer, and don't build cake. No, really, build cake if you like it, but you don't have to.
Just scoop out the ash and wipe out the chamber with an abrasive paper towel. This will maintain a thin carbon layer, maintain the original diameter of the chamber for the life of the pipe, and avoid the wear and tear of reaming, especially for new pipe smokers who can do real damage with a reamer.
It's fun to ream, and so many new pipe smokers overdo it and score the briar.
It's an option not to ream. I have smoked for decades and have never owned a reamer, and the pipes and their chambers look great. Also this somewhat reduces ghosting, since there is much less material to carry over flavors.
It's a break with tradition not to build cake, but why not join the rebellion.
Then you only need to a reamer if you restore estate pipes.