I would have no objection to a build of 2 or 3 F5000, but better armed and call them AWD Mkll, then switch to T26 once it is seen that they are more serviceable in anti-sub warfare role. The T26 does seem to be the more modern and up to date ship.
It's entirely possible they will be better armed.
Building an F-5000 now I would be looking up swapping out the 2x25mm for the new 2x30mm (which can shoot anti air rounds), same mount. Don't install harpoon, go NSM launchers instead, which we could hopefully fit 12 of for the same mass and deck space. Consider seaRAM to replace phalanx. Combined with an Aegis that is compatible with BMD/SM-3 you have a more capable ship. Newer 3 band radar that is higher, more illumination, better aegis, better CIWS, better against asymmetric threats, double the helicopter or UAV capability (NSM armed? UAV with hellfire?), 50% more anti-shipping missiles, each much longer ranged and more effective. The ASW capability will be inline with our allies, most of which are operating burkes or burke variants. We won't be taking on the world by ourselves.
I don't see how anyone could be disappointed with that.
Australia seems to love waiting for the creation of some sort of high risk uberunit. While I had high hopes for the Type 26, I am not so sure now. Missile VLS load is limited, speed is limited, I think its flex capability won't be a great capability now Australia is building a lot of OPV's, you sort of doubling up with it.
If we are going to build a brand new hull type. Bugger it, build a flight III Burke. Size wise there really isn't much in it anymore.
If the last 3 future frigates were built off a de-risked Flight III burke, with the new Aegis/9LV system that would really round out the 3 x AWD, 6 x F-5000 major surface combatants. That hull would then be the base of future replacement ships.