Considering the current geostrategic and geopolitical situation as well as the JATF concept and planning, I would go for the BAEs ACV being introduced into service by the USMC, as the NZLAV replacement. It would also be the base vehicle for the 105mm turret and the SPAAMG turret. Each ACV is able to carry one NZ Army section of 10 bods plus a crew of 2 and it would have a remote Rheinmettall 30mm turret with Spike LR ATGM. The ACV is designed for a capacity of 13 bods plus 3 crew so with the NZ army section size there would be ample room left for extra section weapons and kit. The way I see it is that the section and crew could basically live out of the vehicle. The vehicles would belong to the platoons / companies / battalions, not a separate unit and the vehicle crew would be part of the section. They would provide fire support to the section when its dismounted.I tend to agree with a lot of your assessment and I'll walk back some of my earlier comments (rushed thoughts and writing whilst getting ready for work this morning etc).
Future options such as Boxer could fit the bill perhaps, for IFV & medium fire support provided by the same vehicle (or did you have something else in mind)?
But for now we have the LAVIII until a decision on replacement or upgrade is made. Can you see any realistic upgrade options for the LAVIII?
And are you envisaging IFV's being supplied by an armoured regiment (eg QAMR) or equipping one or both infantry battalions as per the original LAVIII requirement?
I'm not convinced of the LAVIII base options for heavy fire support (something that has been raised here over the years eg the 105mm gun option). So rather than basing heavy fire support on whatever base is chosen, would the NZ Army be better off looking at self-propelled howitzers (such as the Singaporean SSPH1 Primus or following Australia's lead with the K9 for interoperability reasons)?
I know you are an advocate of ditching the unprotected towed howitzers, so perhaps some contenders?
In terms of tanks, yes I would now say unless NZ forces are fighting peers with heavy tanks it probably isn't the most pressing item at the moment or foreseeable future, when better equipping and sustaining a mobile light / medium force would be needed first. I'll park that idea up.
In terms of having some for training purposes (and I was envisaging something slightly older, second hand and thus super cheap, as they wouldn't be deployable or needed to be at FOC levels nor need the full range and quantities of ammo etc), but I guess anything else could substitute for training in NZ conditions (as it can be simulated anyway), but presumably the key is something that is actually up-to-date and fully inter-operable and has the necessary data-links to contribute to the modern battlefield environment (even if it is another IFV or similar type) .
The reason why I chose the Rheinmettall 30mm gun and Spike LR ATGM is that the Rheinmettall 30mm ammo and the Spike LR missiles are to be licence built in Australia and it would be logical and practical for us to have our munitions source close by rather than half a planet away. I hose the remote turret because it doesn't have the basket hanging down taking up space. The ACV because it can swim ashore freeing up the LCM for other required vehicles. The SPAAMG turrets because the army doesn't have any AD capability and these turrets give it a mobile SHORAD capability with gun out to 2 - 3,000m and missile to 5 - 6,000m. The 105mm gun / howitzer turret because it's still cable of doing damage and on an ACV is able to keep up with the infantry and provide heavy arty when and where required. I did look at tracked 155mm but I went for speed and agility instead because that's what's required with the structure of the infantry. We are talking of a fast moving Mounted Rifles Regiment, rather than a heavy armoured regiment.
I have deliberately used the Mounted Rifles because of the history of Mounted Rifles within the NZ Army and their actions in Gallipoli specifically Chunuk Bair, and Palestine. I see it as a similar MO of riding ones steed into battle, dismounting and fighting on foot. In this case the steed has eight feet, is armoured, armed and has 12 fighters inside it, ready to inflict righteous justice upon the enemy. Then home for tea and medals.