Well, as luck would have it (both good and bad) I discovered that the Blackhawk Serpa that works for the Sig P-229 will work for the SP-01. One catch, there will be about 1/4-1/2 inch of the muzzle sticking out below the bottom of the holster.
Now the bad. It will not work with the Phantom due to the Phantom's polymer frame being slightly wider than the metal SP-01's frame. (sigh)