I only know of one person who has managed to get both his AIPs, and one was Q-CSRO as a Sgt and then QHCI as a FS. Other options for WSOps included Q-SAR and that was about it. AP 3392 Vol7 Leaflet 802 which whilst almost certainly a legacy document now, was the reference at the time.
Remember you must apply for these at differing ranks. I also had CSRO and QHCI but could only claim once as both were achieved at the same rank. Unfair methinks but it is what it is and as I suggested earlier; the application process is very black and white.