Sea harrier FA2 has 2 ARH and 2 IRCCM.
F-14A is at 12.7, so you just supported the argument that 12.7 is not a bad BR for it by since you “cant thing of a single reason why they would be all that different”
If we look at planes at 12.7 or that it would have to face for some nations, we will see it’s not all that bad of a change to go to 12.7:
USA:
12.7: F/A-18C Early 6 AIM-7Ps, F-14A Early 6 Aim-54 or 6 AIM-7Fs
12.3: F/A-18A 4 AIM-7Ms (same as F-15A), F-16A 6 AIM-9Ls
12.0: F-4J 6 AIM-7F, F-4S 6 AIM-7F
11.7: A-10C 4 AIM-9Ms, F-111F 6 AIM-9Ls
USSR:
12.7: Mig-29 2 R-27R or R-27ER (both better than AIM-7M) 2 R-27T (IRCCM) 4 R-60M, Yak-141 4 R-27R 4 R-27T 2 R-27ER 2 R-60M
12.3: N/A
12.0: N/A
11.7: SU-25SM3 2 R-73 (IRCCM), Mig-23ML/Mig-23MLD 2 R-24R 2 R-24T 4 R-60M
China:
12.7: N/a
12.3: JH-7A / JH-7A Prototype 4 PL-5EII (IRCCM) 2 PL-8 (40G of pull),
12.0: N/A
11.7: N/A
France:
12.7: F-16A OCU 6 AIM-9Ms 4 R550 Magic 2 (IRCCM), Mirage 2000C-S5 2 Matra Super 530D 2 R550 Magic 2, Mirage 2000D-RMC 2 R550 Magic 2
12.3: Mirage 2000D-R1 2 R550 Magic 2, Mirage 2000C-S4 2 Matra Super 530D 2 R550 Magic 2
12.0: Mirage F1C-200 2 Matra Super 530F 1 Matra Super 530 2 R550 Magic 2, Mirage F1CT 2 Matra Super 530F 2 R550 Magic 2, Mirage F1C 2 Matra Super 530F 1 Matra Super 530 2 R550 Magic 2
11.7: N/A
So really it is not bad to be at 12.7 if you’re so worried about the IRCCM seeing how there are already plenty of planes at that range with IRCCM.
If you’re truly dead set on AIM-9Ms being a problem at 12.7, then you should be all for the proposed system of BRs changing based on what ordinance you unlock.
For example, F-15A gets moved to 12.3 until AIM-7s get unlocked and it goes to 12.7. Once AIM-9Ms are unlocked, it goes to 13.0. Then you don’t have to deal with ARH while stock, and 11.7 doesnt have to deal with AIM-9Ms.
Now if you compare the F-15A to the planes ABOVE it, that’s where the problem becomes clear especially since majority of games are up tiers.
This list I will make short and quick and only include US and Russia
USA:
13.0: F-14B and F-14A IRAF 6 and 4 Aim-54s respectfully, AV-8B plus 4 AIM-120
13.3: F-16A ADF 6 AIM-120,
13.7: F-16C 6 AIM-120s/6 AIM-9Ms, F-15C MSIP II 8 AIM-120/4 AIM-9Ms,
14.0: F/A-18C Late 10 AIM-120B or C 6 AIM-9Ms, F-15E 8 AIM-120B or C 4 AIM-9Ms
Russia:
13.0: SU-33 8 R-27ER 6 R-73 (IRCCM), Su-27 6 R-27ER 2 R-27T/ET (IRCCM) 6 R-73,
13.3: Mig-29SMT 6 R-77 2 R-27ER 2 R-27T/ET 6 R-73, SU-30Mk2 AMV 6 RVV-AE 6 R-27ER1 2 R-27ET1 6 R-73E,
13.7: SU-34 8 R-77 8 R-27R/ER 8 R-27T/ET 6 R-73, SU-27SM 8 R-77 6 R-27R/ER 2 R-27T/ET 6 R-73
14.0: N/A