Makes no sense to fit any of this stuff to the OPV's.
They are very much the wrong ships to do this to. Even if you wanted to fit them to something, lurrsen/NVL has the MMPV90, which at 10m larger a much more capable platform, being some 500t larger and could embark things like VL sam, CIWS, antiship missiles, and a proper main gun, combat style radar, etc.
We made the very specific and active decision to build ships that cannot, ever, fit any of these capabilities. Despite something like the MMPV90 costing basically nothing more in build/procurement cost and essential no extra crewing unless we wanted to fit these extra systems. Not only that we didn't spec fitout for any further upgrades, least powerful engines etc. So low spec we are building them without a main gun.
I will say it. Corvettes are impossible and will never ever happen.
We had our chance to build 20 off shore corvettes. We blew it. They didn't have to be fitted with weapons, but they could have had space/power/weight available or a mix of fit out. It wouldn't have costed any more or taken anymore time. In fact it would be have been a more straight forward project because the weapons we now want would have been already integrated on the platform. The Bulgarians are building them right now. Mind you the Bulgarians are doing this at a yard that has never built a navy ship before. They even are using saabs 9lv combat system.
German shipbuilder NVL Group laid the keel of the first of two corvettes for the Bulgarian Navy in Varna, Bulgaria on June 17, 2022.
www.navalnews.com
So unless we sinkex the entire Arafura class, and start again none of this is going to happen. If it ever does, that is even worse, because clearly, its a stupid idea that is tactically bad, take away from one of the primary capabilities of the OPV's situational awareness with no more drones or helicopters. Sitting ducks. What is Cdome going to do? Against the Chinese? A more than peer capability. It might make them more relevant against high end pirates in SEA, where our OPV's won't be able to function as the pirates have more capable ships and weapons.
If we wanted a multirole OPV with light combat capability we could have had one with 9vl/CMS330, ESSM/MiCA/CAMM, NSM, 76mm, CIWS, and small ceafar2/girraff, hull mounted sonar etc. Integrated into the platform. It would have costed us a total of 500t of steel and the labor to shape and weld it. We could have had this capability on top of pretty reasonable OPV capability, everything the Arafura/Darrsulum class can do. We could have crewed 20 of them. We could have afforded to build them, we would have already been 7-10 ships into that build.
We specifically, choose not to. Damen and Fassmer were surprised we decided to go with such a low end capability, their bids were more capable. Even if you had no intention of fitting those weapons, that extra length would have been a rounding error in terms of costs. The platform we selected cannot have these capabilities put onto it. Further, we have modified them so they cannot be armed even to the extent Brunei has.