The SM-6 Block IA is a 6.6m long missile weighing 1500kgs that features a 13.5inch (34.29cm) diameter missile body and a 61.2inch (1.57m) wingspan.
The AMRAAM-ER based on the ESSM Block II missile body that has been integrated onto the NASAMS Mk2 canister launcher and is a 3.66m long missile weighing 280kgs featuring a 10inch (25.4cm) diameter missile body and a 44 inch (1.12m) wingspan.
Even the smaller Block IA variant of the SM-6 is far too big and heavy a missile to fire from a NASAMS Mk2 canister launcher (even if you removed the booster, which seems rather self-defeating for a ground launched missile) it would still be far too big and heavy.
Raytheon (RTX) has previously discussed the idea of integrating their SkyCeptor missile onto NASAMS, a missile that comes in at 4.95m long, with a 9.1inch (23.11cm) missile body (12 inch - 30.48cm with booster) and a wingspan of 19 inches (48.26cm). But even that would require the development and testing of a longer and wider NASAMS canister launcher.
That missile would give us a genuine Medium Ranged AD capability with ranges in the vicinity of 180k and altitudes of up to 50k, as well as terminal BMD interception capability (if paired with an appropriate sensor and C2 environment) but it remains a “what if” until someone invests in it. The only current users are those who employ the Israeli version of the missile (Stunner) in the David’s Sling SAM system and Romania who are integrating it into their Patriot PAC-3 MSE systems. It really is a missile in the class of Patriot PAC-3 MSE.
It would likely be a great capability boost for Australia’s (virtually non-existent) Integrated Air and Missile defence system, but good luck in convincing the ADF, when we would be an orphan user of such a system. They won’t (or are nit allowed) to even buy the AMRAAM-ER missile which IS integrated onto NASAMs and is already on order by other NASAMS users and which would offer a boost to capability, but isn’t even half the missile SkyCeptor is… One potential advantage which addresses yet another problem as mentioned by
@Takao is the cost involved with such high-end missiles. According to RTX at least, the SkyCeptor is substantially cheaper than other missiles in it’s class, so that might help if true - certainly Romania seems to agree, but we all know what ADF’s appetite for developmental programs where they would be the lead customer, is like… Still funding this could easily lead to other NASAM’s users adopting it after us, so you never know I suppose and Australia’s version of NASAM’s itself was a developmental version of the basic system afterall…
As to AIM-260, there are no specs available to begin to assess whether it could ‘work’. The whole program is classified, but of the information that is out, I have not seen any indication of a program to adapt to a ground-launched configuration…