Aren't Backfires, Blackjacks etc a bit more worrying, if resurrected ?
As to Kangaroo, I'm no expert but having seen the size of that thing ( and age ) wouldn't it be carried at least partly externally - Bear experts welcome to jump here - , so visible, and anyway even the shameful UK defences ( though not quite as bad as made out ) could probably get that one if ignoring the possible nuclear contamination side of any debris.
I suspect there are much more modern & efficient nasty stores to worry about, so the age old snag remains, deciding from intelligence etc if the delivery aircraft means business & is ok to shoot down...