beautiful pipe, fishingandpipes.
I keep my rims clean by using a pocketknife to keep the cake away by carving it down a couple of mm's below the rim, but you need a steady hand and eye.
I keep the tobacco packed down below the rim, about a quarter of an inch. Also, hold your fire source about half an inch above the rim and draw the flame down to the tobacco with your breath. The flame doesn't have to touch the tobacco, just the heat.
To clean the rim, use spit and a good clean cloth. Spit works slow, but it does dissolve the char and creeped cake well, without messing up the finish. On rustication, I use spit and an old electric toothbrush.
I hope that helps, and once again, beautiful pipe!!!