Most high quality, natural-hair paint brushes are hog bristle (obviously not what you're talking about), sable (usually some species of martin/weasel; the best are Kolinski), squirrel or (in the oriental tradition) goat or wolf. Camel hair brushes are rare and specialised -- the hair isn't stiff and resilient enough for thick paints (hog's territory), doesn't taper enough for detail (sable, sometimes badger, and wolf), and isn't suited for edgeless washes (squirrel and goat).

You can try a small squirrel mop (sable is stiff enough to scratch if the dust particles are hard enough; hog is, of course, out of the question, and the equally-soft goat is usually mounted in wide, flat brushes). You can do the spinning thing by rolling the brush between your palms, like a Cayley top (or taketombo). Just be aware that new brushes -- even mops, which use a soft ferrule -- will shed hair, so it will need to be abused before use. You'll also want to wash it using plain soap and water and rinse it thoroughly before using it. You might find that having a dielectric in contact with the brush tip while spinning generates a better charge.

No guarantees, of course, but if you want to try a cheap alternative, you can't actually hurt anything with a squirrel mop. You can hurt the sensor filter with almost anything substantially stiffer.