Ironically, have one of these for an upcoming project. Amazing what you can squeeze into a SC, isn't it? I postulated some kind of ECM-carrying warhead, preventing a defender from targeting the rest of the wave behind them.
How about if each ECM equipped missile is treated as 2 missiles for point defense interception purposes?
So an LRM-20 fires a mixed salvo with 15 regular (i.e. damaging) missiles, and 5 ECM missiles? If point defense is used to engage the salvo, the first 10 hits from point defense are against the ECM decoys and ECM missiles. When rolling on the cluster table, the ECM missiles are not counted.
ECM missiles are counted for ammo explosion damage purposes (this makes the math easy), but do no damage to the target.
So if your opponent has lots of AMS, you would want to bring lots of ECM missile capability. You would still want to bring a few units with regular missiles in case an enemy unit does not have active AMS (ran out of ammo, too much heat, has been shot off, or never had one).
Higher technology ECM munitions provide additional false targets.
But at this point we are packing decent ECM generators onto missiles that mass a total of 8.34 kilos. Comparative rockets currently existing are:
Hydra 70 - 6.2 kg (7cm W, 106cm L)
Folding Fin Aerial Rocket - 8.4 kg (7cm W, 120cm L)
M-16 Rocket - 19 kg (11cm W, 79cm L)
3.5 inch rocket - 24 kg (8.3cm W, 140cm L)
Then again, we are capable of installing Artemis Guidance systems into LRMs without affecting warhead size, so it could be possible.