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Usually Whippeddog.com has some barber hones as well as gemstarcustoms.com I just looked and they both have several.

It might take 200 strokes or more though and be sure its lapped smooth.

It should freshen an already good edge. i would use it at the first signs of degradation if it was my only hone.

Though the chinese 12k is inexpensive it would take forever to touch up a razor with it imo.

If the blade has a good edge already I would get a good slow coticle. They produce a very nice edge and can take the place of several synthetic stones if you need to remove a minor flaw from the edge.