The new South Korean KSS-III Submarine have K-VLS onboard if you are into that thing, South Korea have complete set of KSS-I (Chang Bogo/ U209 1400 ton), KSS-II (U214) and KSS-III (local made with AIP+VLS). Mind you that South Korea got missile and VLS technology from Russia, just google the Hyunmoo missile if you wanna see it yourself. That is why i think Indonesia picking South Korea for it's submarine fleets' modernization is a good move, the rest depends on our will and budget.
KCR platform have some potential, don't just see it's small size or that it's not a corvette, but that if they did able to do their job well or not. Last time i heard about them is the deal to MBDA to provide missiles (Exocet) and Terma's CMS for newer KCRs, so i think we could expect more improvement to the KCR platform (at least it's no longer Chinese jeroan). I propose KCR equipped with some cheap 30mm CIWS in place of main gun (or 57mm multipurpose whatever), Simbad RC and 4xNSM (or Exocet), it's probably the best option available for KCR.
Replace the upper 76mm gun with 30mm CIWS, and the lower gun with bigger 127mm cannon, add TASS for better ASW capability, replace harpoon with NSM or any better western AShM, if possible keep the Mk41 and Mk56 as every other choices is simply out of question.
Also, revive the National Corvette program or at least get serious with the PKR/Frigate shit
We got LPD and Submarine deals from South Korea, we were not disappointed by them. The Pinoys asked more for less, that's why they got into such a problem.