Progress!
The well guys arrived early at 7:00 this morning. They used this camera to determine the situation. I didn't want to make a pest of myself by taking too many pics but here are a couple:
The packer is 60' in length and in good condition. The 7" well casing (I thought it was 6") is also in relatively good shape both above and below the packer. The well guys think the used pipe casing may have been damaged when it was installed in the rock ledge, hence the need for the packer.
The camera found the broken pitless adapter on the end of the iron supply pipe at a depth of 78', about 6' below the end of the packer. This is fortunate because it gives them clearance to work. Had it been inside the 4" packer, there wouldn't be enough room for the camera to line up the recovery tool. I asked about removing the packer but they said doing so would likely damage the well.
Since the adapter is down 78' from the well head, that means the pump fell about 74' when it broke. I don't know why the pump was installed that high off the well bottom. The well guys don't know either. That's a lot of wasted water storage.
The threaded recovery socket in the top of the broken adapter is intact but fouled with some debris. The guys think it can be cleaned out so a standard threaded pipe recovery tool can be used. They give it an 80% chance of success.
If they can't pull the old pump, they have a tool which can cut the supply pipe and wiring. The old pump can then be abandoned at the well bottom and a new one installed above.
The well guys said the broken, light duty, pitless adapter used in the well was not designed for the weight of the pump & pipe. That is likely the reason it ultimately failed.
There's hope!