Since I think its safe to say we're all a little skeptical of the "J"unk feature, I was thinking of ways it could still be implemented, but that we could trust.
Rather than totally dropping the signal report (even when there may still be Ka signal coming in) perhaps the V1 should give the J tone and display "J" but simply supress the Ka alert down to muted volume, that way the user can discern if it is indeed a real radar source. I would imagine leaky RDs would fairly quickly disappear. That or maybe tapping the "mute" knob could bring the Ka alert into muted volume and out of "unreported" state. Of course this behaviour should probably be another letter option, so that the old method can still be used, but I think, for now at least, it would build confidence until we can definitively see that real radar sources aren't "J"ed out.