The Bunker Group
Sigmas certainly more affordable then the Modified Iver/Arrowhead 140 let alone FREMM. Seems the problem is level of workshare and tech transfer between Damen and PAL.second batch of Sigmas could have some upgrades if wished & affordable.
Actually from what I gather before from PAL it self and MinDef, the actual plan is Sigma Light Frigate as Van Speijk replacement for GP and ASW. While Iver based for AAW. FREMM coming from nowhere, rumours due some disatisfaction with Damen and MinDef assesment for larger Frigate.
Damen in Indodefence 2018 already bring design of lenghthening Sigma PKR from 10514 to 11514. Make it able to equiped with 16 Sylver VLS. Similar on what that they offer it to Greece. For larger frigate they offer their Omega design (based on Zeven Provincien hull). Somehow fincantieri can cut in and offering their version of FREMM.
So FREMM actually become replacement program for Sigma PKR that seems so far will be stop after two building. This FREMM also got critics from some retired Admirals that consider them to costly for TNI-AL operation. Personally I agree with them. Then again, Politics choice overide users assesment.