Firstly Oldsig is bang on. Secondly the 'upgrade' you are proposing is significant and expensive. All of this would need to be integrated into the vessels CMS ... which being based on Aegis elements is not the same as our current systems. Even the radars proposed are not in our current inventory and need to be modified. In addition this things chew fuel at 40knots and this is not a speed they can maintain without support.US Navy proposes decommissioning first 4 LCS more than a decade early
A Pentagon proposal would retire the first four LCS in an effort to save money.www.defensenews.com
The two steel-hulled Freedom vessels have more potential in my opinion, as they're practically identical in size to an ANZAC frigate but their aluminium superstructure is sure to reduce the centre of gravity issues found in the ANZACS. As such, i would fit the Freedom's with 2x8 Mk41 strike-length VLS for 8x LRASM/32x ESSM, in the modular space used for the twin aft Mk46 30mm guns as well as NULKA launchers immediately forward of the VLS as has been alluded to in the past for retrofit into existing vessels, b. remove the Hellfire VLS and RAM launcher and replace with a single 40mm Oto Marlin RCWS to help mitigate the added top-weight of the Mk41's and provide an aft facing gun, c. replace the TRS-3D and modify the forward mast for a Vampir-NG IRST, ES-3701 ESM and a navalized version of the lightweight CEAOPS radar with four smaller fixed X-band faces rather than C-band in the Army version for ESSM/SM-2 illumination/short range surveillance + the same single larger slewed/rotating dual S/L-band array for long range surveillance, d. add the Saab 9LV Australian tactical interface to the COMBATSS-21 combat system. Retain most of everything else like the 57mm gun, EO/IR sensors.
ASW would be a toss up for me, twin MH-60R's is fantastic and they've fiddled around with a few towed arrays including CAPTAS4, but I don't think much thought of acoustic dampening was put into a design meant to fly at 45kts. If an active hull mounted sonar like Kingklip Mk2 could be fitted that wouldn't severely interfere with the crafts high speed then i would do so along with two topside Mk32 triple tube mounts for MU90 either side and aft of the 57mm gun. If that were unfeasible you could fit a quad pair of RGM-184 Naval Strike Missile in the same locations as the proposed Mk32 SVTT's, and just use them as giant fast attack craft/missile boats with potential loadout of 24x AShM's.
And I will go back to my mantra ...... you cannot simply bolt stuff on a vessel. All added gear has structural impacts as well as the need for wiring and services. It is all expensive and really simply not worth it. Spend the money on the curret hulls in scope.