Yup, that's the same technique we're talking about; using a simple optical slave on the remote flash (in this case,
SU-4 mode on the SB-800), and then having your master/commander (in this case, the pop-up flash) do the strobing. Problem for the OP is that the SB-600 has no SU-4 mode, you can only find it on the SB-800 or SB-900.
