It will probably be compatible with the Javelin CLU because it exists and it's already been done with Stinger.
Firing Stingers from a Javelin launcher could be especially useful for engaging aircraft, drones, and missiles at night and in bad weather.
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There's very serious reasons to believe that a top attack anti-tank missile, with a HEDP warhead and a fragmenting sleeve, can replace nearly all MANPADS except very high performance ones like Starstreak. Even then, Starstreak can defeat light armored vehicles anyway. Javelin already has a capacity to engage low flying helicopters with its direct attack mode, and it's far more credible at that than using mostly hypothetical things, like TOW or Dragon, in the role.