I have heard back from two former bosses - from when I asked them about looking for better work. They were both extremely helpful and really pleasant. One told me that I had gone about as far as I can go in this department, barring my boss taking early retirement, but that there are other supervisory positions in various different places that the umbrella company of my company handles may be open. And several former English teachers of mine are rolling over in their graves with the run on sentence I just slapped down there.
The other old boss said that he would be calling me and setting up an appt to talk to me at length.