There is a pretty big 'tent' that the RN adds when helos are embarked. Fills the space between the forward crane and the superstructure. It could hold at least four MRH sized helos, maybe more. But for the RAN as a sealift ship as is seems almost perfect as her role would be to ferry stuff between logsitics port and the LHDs so whe doesn't need to be able to operate helos just land them, carry them and launch them once.
Agree that she would be about perfect as she is; but keeping access to the tent or some similar would increase her versatility. And, we already have a great name - as I said in another place - Jervis Bay III for sure. So, people in the right places in CDG, let's just do it!!