I just thinking if the RAAF can use a Spanish F-18 to clear using the drogues what's the *&^%$#@ problem? The pods can't be that different and the Typhoon can use the Italian B767s.
Dat, that is nowhere near what has happened. Spanish F-18 was use purely for DT&E for the HDUs and Portuguese F-16 for initial boom trials. These are not clearances.
Once KC-30A arrived in Oz, the Classic OT&E took place. Very intensive through the envelope as Beags described, over 2011-12, I guess. Then the Supers were done and finally cleared about 2 months ago.
This is a long drawn out process to ensure fit for service and safety, not as you suggest.