With re-painted WM egg (assume that it would be WM-25 because of Sea Skua/Sea Cat missiles in one variant). The GWS-24 Sea Cat used the Italian Alenia Orion RTN-10X fire control system (Type 912 for Type 21 frigates, the Signaal WM-25 also has SARH guidance. Another option could be WM-28.
For re-painting the Signaal "egg" I followed the original, but with variations of grey.