JHMCS actually isn’t that hard of an upgrade. The all aspect EO/IR, targeting system, and ability to carry 2x2k lbs J-weapons will be a tougher upgrade to fit on an F-22
One thing I have been waiting for is the ability to carry low-RCS weapon pods. This could mean additional air-to-air ordnance stored on the wings for the F-22.
If I remember, the Raptor is capable of carrying on wing stations at the cost of stealth.