Daryl's question was about an AV-8A, i.e. 1st generation. However I think the answer's still the same: carrying an LGB and dropping it is a bit of switchology and wiring. RAF GR.3s dropped Paveways during the Falklands war on targets illuminated by FACs on the ground, so it must be possible for a 1st gen aircraft.
As to re-packing the guts of a designaotr pod into the nose of a GR.3, I think that's on too. If you look at a contemporary TIALD pod, it isn't huge. You might have to fatten/stretch/reprofile the nose extension a little, but you're going to have to do that anyway to accomodate the sensor head. You'd probably also have to lose the side-facing F.95 camera, but again, probably a worthwhile trade-off. If the mose ended up longer and heavier enough to cause a problem, you could always fit the extended tail fin from the 2-seater to compensate.