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To make the NSC an LCF or littoral combatant frigate and a small one at that you need resizing the hull to accept strike length Mk 41 VLS with 48 cells and pair it with a littoral combatant corvette while retain shallow draft on both ships.

The small corvette or frigate Aegies system permits the best possible defense against supersonic sea skimmers as the radar is always staring at the horizon. This would go on the frigate LCS and conventional missile defense system on the littoral corvette.

Armament for the LCF would be a five inch gun with firing rate increased as has been proposed and fitted with the Sideshooter RAM systems. A 35mm Millenium CIWS would be mounted on top of the helo hangars. Nixie torpedo decoy, ASW short torpedoes and twin wire guided MK 48 full size dual purpose torpedo tubes mounted in the stern (a program to arm USN ships with Mk 48 torpedoes died many years ago, pity). Main armament would be a 48 cell VLS for Tac Tom, SM-2, VL-ASROC, ESSM. Canister launchers for Harpoon. EW and ECM. Satcom and towed array sonar to complement hull array and with very long endurance with fleet speed of 30 knots on CODAG propulsion wit 20 knot fleet cruise speed. Various unmanned vehicles would be carried such as a USV, UUV and UAV along with one or two helos. The unmanned USV and UUV would be for force protection, ASW, mine detection resulting in a fairly large ship from the ship steel standpoint but steel is the cheapest cost component of a warship.

The LCC would be around 1500 tons at the upper range in corvette size. Armament would be five inch gun (ads say it can be mounted in ships as small as 1200 tons), RAM launcher, self defense size eight cell VLS for quad paked ESSM, ASW torpedoes, two twin Mk 48 dual purpose torpedoes, PAM/LAM launcher with all diesel or diesel/gas turbine propulsion with transatlantic range at fleet cruising speed and fleet maximum speed. A hull sonar and if possible, a towed array.

These ship types would be complementary to each other and not competive in this high, low end arrangement.

My guess is that the LCF would be larger than the Perry class due to having adequate space for various unmanned surface and underwater vehicles to say nothing of UAVs. The torpedo tubes provide greater range for ASW and can sink any warship from FAC through corvetes and up through frigates and destroyers and this is done via two way wire guidance links. Of course manuevering would be restricted to avoid cutting the guidance wire accidentally. Maybeye we could have a vertical launch Harpoon in the VLS. I haven't figured the loadout.

No configurable mission bay would be present but rather an unmanned vehicle storage and launch/recovery facilities. In sizing the superstructure there would be sufficent hangar height and length to accomodate SOF CV-22 or USMC MV-22 Osprey tiltrotors.

Millenium is a good CIWS as established in trials sometime ago. If WLY-11 antitorpedo torpedo ever gets out of the lab and into the fleet, the submarine threat would be reduced effectiveness of torpedoes. The ATT is only 6.75 by 120 inches and weighs in at 200lbs. It is also being worked on as a ultralightweight ASW torpedo which would make possible carriage by VTUAVs and greater number of torpedoes for MH-60R.
RAM is fire and forget system for AAW. PAM/LAM could be mounted and serve, along with the five inch gun, fire support duties. Tac Tom should be carried, albeit in limited numbers. SM-2, SM-6, ESSM are possible AAW weapons with an antisurface capability.

I guess we are exceeding 4000 tons which hopefully not be a financial show stopper.

Does anyone know the cost of the scaled down SPY-1F and SPY-1K. I'll have to check Combat Fleets and Naval Weapons to get more info on these systems and required ship sizes common to various sized ships.

The low end LCC corvette would have to have adequate displacement for self defense eight cell ESSM VLS. The five inch gun is mounted on the smaller ships of the Italian Navy and they also have one light helicopter and hangar. The main offensive punch would come from Harpoon and operating the ESSM in an antisurface mode. ASW hull sonar and Mk 46/50/54 lightweight torpedoes and possibly fixed main deck mounted 21 inch tubes (say two twin P/S) for Mk 48. RAM would round out the armament by acting as a CIWS.

I need to do some research here.

You have a good point. Unless a general purpose Aegies frigate could be shown to be signifiantly cheaper and more capable than more Arliegh Burkes, then we should just build more of them with the rearrangments that you propose.