As far as I know, nobody does photoetch for these kits. Norm Veber used to but, I think I got the last set and I am holding on to them. If they will work for you, I do decals for the emblems in my resin 71-73 Pinto Wagon. PM if you need a set.
Your info is pretty correct. Just to clarify a few things. MPC did 77-78 and, 79-80 Wagons. As far as I know, they never did a non wagon 79-80.
For what it is worth, the MPC kits are much nicer.