What western weapon package for PN you can expect for these ships even if they came in standard ada configuration, PN may have Harpoon block-2 on T-21s which could be last option if noting good is available from west also PN seems to be interested in SA SAMs too.
Antiship there are plenty possibilities from the West besides Harpoon: Atmaca (Turkey), NSM (Norway), MM40 blk3 (France), MARTE ER (France), Otomat Mk2 Blk4 (Italy), RBS-15 mk3 (Sweden), with NSM and Marte being lighter missiles and Otomat and RBS-15 being heavier ones and MM40 and Atmaca in the same bracket as Harpoon. If you make friends again with the US, there is deck-launched LRASM to consider. From China, it would be C802A or C602.
The RIM-116 Rolling Airframe Missiles, together with the Mk 49 Guided Missile Launching System (GMLS) and support equipment, make up the RAM Mk 31 Guided Missile Weapon System (GMWS). There is little direct equivalent to this. To mind spring primarily the French Sandral (a sixtuple-round, sensor equipped, remote controlled launcher for Mistral Manpads), Tetral (4 round remote control launcher) or Simbad-RC (two round remote control launcher), and the Turkish Atilgan and Bora naval mounts for Stinger and similar MANPADS e.g. Hisar-Manpad. Raytheon (US) used to offer the Sea Scorpion 2 (lightweight RC launcher with 4 Stinger missiles per mount), similar to Bora. Finland has a 6 round manned shiplauncher for Mistral. Wayback, there used to be 2-3 options for naval mounts for the British Startstreak Manpads (including proposed SeaStreak CIWS), now reincarnated into the direct attack laser guided Thales LMM (lightweight multirole missile), for which there are several launcher options, but I don't think this is employed for surface to air role. Possibly a naval launcher for RBS-70, but I don't think this is offered in any other form than found on land (i.e. single, manned pedestal launcher) although there once (late 1980s) was a 2x2 round launcher around the Signaal (now Thales NL) LIOD electrooptical director. But RBS-90 mount or ASRAD/LeFlaSys mount could offer starting points. Israel: Red Sky II (accepts a variety of manpads). From China: HQ10/FL3000N or that QW3 boosted Manpads remote control pedestal mount.
Otherwise, its the larger canister-launched VL systems (France: Mica, UK: SeaCeptor, Germany: Iris T, Sweden: Bamse, South Africa: Umkhonto, Turkey: Hisar-A/O, South Korea (K-SAM) but these need a VLS and a place to install it (which begs the question where to put it on standard Ada)
ASW torpedoes and tubes available from UK (Stingray), France (NTL-90 Murene), Italy ( Whithead A244, A290), or multinational (Eurotopr Mu-90), Sweden (Type 43X2
), South Korea (K745 Chung Sang Eo Blue Shark), US (Mk 43-48, 50, 51, 54)
Helicopters: China (Z-9), France (SA 360 Dauphin, SA 365/AS365 Dauphin 2), Multinational (NH90), Italy (AB-212), UK/It (AW-139/1/49/189), UK (AW-159 Lynx), US (Sikorski SH-60/70, S-76)
And so on.
Choices abound. Constraints: a) cost v budget, b) applicable export controls, and c) political considerations.
I much like the
Although I would look to stick on a Thales I-mast, I-400 or at least I-100 given this weapons fit. I-500 with APAR if e.g. with Mk41/ESSM.