Capt Claret,
Yes, however you are still either within the Gove MBZ operating on MBZ procedures or you are in the CTAF. As long as you are within 15NM (I assume) of Gove then you treat it as an MBZ and make all the appropriate calls, once outside, it's CTAF procedures.
Derby MBZ is contained within the West Kimberly CTAF and is on a different frequency. While within the DBY MBZ there is no need to make any CTAF calls (although it's best to change to the CTAF a bit early so you can get a feel for what's going on).
At no stage are you actually in an MBZ
and a CTAF you are just in an MBZ which is surrounded by CTAF.
I was specifically refering to the poster's example of operating from an ALA within an MBZ. You don't have an ALA with a tiny CTAF area surrounding it within a 15NM MBZ.
Cheers
