I would definitely not recommend involving Lucas' kids or family in this, that's kind of intrusive and damaging to the cause, IMHO. Maybe writing to Spielberg is alright, but making his friends our messenger boys seems kind of presumptuous. I think the only angle you could pull is a profit-angle. Convince someone in power that it is financially viable to release the OOT.

But media support would certainly give creedence to our cause.

I think, however, that we will need to wait until people are thinking about Star Wars again (for instance, next year will be an anniversary) to generate dialogue on this in the general public.