No dedicated pipes on my rack so far. The reasons are that I don't smoke any blends with exaggerated ghosting problems like Lakeland aromatics; I do not build cake, scooping out ash and wiping out the chamber after each smoke; and I have a lot of pipes all of which get rested, often for months, between smokes. Latakia, Perique, and aromatic flavorings don't ghost my pipes, or at least I can't taste it, which is the same thing to me.
I'm glad I don't feel I have to dedicate pipes. Pipe smoking is supposed to be a function of relaxing and emotionally releasing stress, and one more compulsion would not enhance that for me.
If I bought a tin of Visions of Celephais, the grape flavored aromatic from C&D, I might designate a cob for that, at least until I saw how the flavor carried over, or didn't. I'd try a simple burley in it after a dozen smokes to see if I could taste any grape. If I couldn't, then I'd put the cob back on line for any blend.