I am really sorry to hear that you have been out of a job for that long
I do not fully understand the comparison, have they offered you a return to the US regional?
The part regarding training bonds is only applicable when/if you want to leave.
Do you have any relations in the country of the carrier that flies the KingAir?
Is the basic question whether or not you can suffer the "degradation" of going from a jet to a small turboprop?? If so-
I would go for the better T&C's! I never flew the kingAir but I flew something similar and it was great fun!!
What ever you choose I wish you all the best of luck!