I've never got that impression. To my mind, Beausoleil actually has an old-fashioned organic human body somewhere, but he lives his life through his clank bodies--kind of exactly what the Master of Paris is doing, in fact, but on a much smaller scale (controlling only a few clanks with his body rather than an entire city). It would be throwing a massive curve-ball into the mix at this stage to have clank Sparks that weren't created by Agatha, because that's kind of supposed to be something special that only she can do.