Thanks for the feedback!
Gjn290, they rarely rehire anyone for any reason. The only thing that helps is that my boss is in my corner and will recommend a rehire status for me if it comes to that. But, UPS moves mgmt around all the time, so who knows if he'll still be my boss if it comes to that.
I could get some jet time while instructing, the school here manages some Citations, but it would take forever to build hours and I think like Rickair said, they like the time to be in much larger aircraft. I wonder what preferences they'd give a UPSer?