I think that this thread is filled with interesting ideas, and I like the pictures. People are making compelling cases for several different options.
But I fear that we are all overlooking one very important feature; Would it not be a blind shot to the Tenth Green, even if the tee were moved ahead to make it a 340-yarder? I don't regard the mere notion of "blind tee shot" as a deal breaker. But I can't think of too many great short par-4's to blind-shot green complexes. I had thought that the great charm of holes like #10 at Riviera, for instance, was to see where the hole was cut, and strategize backward from there. Or to generally see the options you have, and then watch the result as your tee shot is in mid-flight.
If a new Tenth Tee (plus a new Tenth Green) were positioned as theorized above, could a player standing on the tee see the green?