IMO CB-90 would be a perfect fit for the LHD's and Choules. Dont know if either have a crane large enough to launch but surely some sort of trailer could be made for internal steel beach launching? That way they could continue carrying their usual load of LCM-1E.
The LHD's have 2 internal gantry cranes, light vehicle/hangar deck and heavy vehicle/well dock deck, both are rated at 16t. The flight deck crane in front of the bridge is rated at 18t.
Choules has 2 cranes between the bridge and flight deck rated at 30t each, not sure if they have an internal gantry crane on the vehicle deck, could not find any specific information, but assuming it would.
So it would come down to weight of the selected boats, certainly easy enough to have rig's for them to sit in on the vehicle decks and then lower into the dock for launch and not take away from embarked LCM-1E's and RHIB's.
Could be room in the well dock also if you exclude the RHIB's, but once again comes down the what you could fit and not take away from the primary task/mission.
I was more interested in whether anyone can see a use for either AAV/ACV or a combat style boat and what they could bring to our operations in the region, and how they could be utilised, otherwise if there is no real use no point discussing
Cheers