Interestingly I believe the Nammer production in the US for Israel is so they can access FMS credits and to relieve local production constraints. It would be interesting to see if we could access a suitably modified version through FMS as it seem to best fit the bill. Cost could be kept down through not ordering the active protection system (maybe make it a for but not with option) although the RWS would drive it up again.
Is the Namer really being considered as an option? I can't imagine it is.
Is it even suitable for Australia's needs?
To my mind it is unsuitable for so many reasons. An ultra heavy (60+ tonne) APC designed for a country where moving it 100km is long distance transport. I believe it was assessed by the US and felt not really suitable for their needs. Put a few of these on the LHD with 60+ tonne Abrams and the vehicle decks will have to be left only partially used, as the ship will be weight limited.
Just on the question of tracks being the only suitable solution for the IFV, what are peoples opinions on the French abandoning tracks and using the wheeled VBCI as the IFV to support their Leclerc MBTs. They claim the VBCI mobility is on par with a tracked vehicle. They may be overstating it but the mobility of modern wheeled IFVs should be good enough for Australia's needs.
The other option, though not ideal, that comes to mind for the ADF would be to order a mix of IFVs and APCs and combine them at troop level. So instead of four IFVs and insufficient number of dismounts or four APC and insufficient firepower each troop would have two IFVs and four APCs covering both bases. Not idea and may work out more expensive than the Nammer option but may be workable. The IFVs could also carry CAV trained additional crew to help out with maintenance and dismounted roles when not lifting troops and provide extra crew to cover fatigue and injury issues when lifting troops.
This is an interesting idea and raises the question does the Australian Army really need an IFV at all.
The USMC does not currently use them.
The Israeli's don't use them.
I am not saying that I think it is the way Australia SHOULD go but what about this as a different option:
Rather than spending all the budget on a high end IFV, a well protected APC could be purchased and the money saved spent on an additional buy of M1s.
(The original buy of 59 M1A1s, I believe cost around $550 million. An additional 45 to 50 would do. The LAND 400 budget is said to be up to $10 billion so $9.5 billion or so would be left for the APC/ Cav Vehicle buy.)
Equip each Brigade with a higher number of M1s and these provide the direct firepower required. Say, two Squadrons of M1s per Brigade.
Rather than having a troop with 2 IFVs and 4APCs as you suggested each troop could have at least one Abrams attached for direct fire support.