Many of the examples quoted were originally piston powered aircraft, that ran into gross weight creep and tropical operations. Hence the designers were desperate for more power, regardless of little details like efficiency.
The only other turboprop jet combos I can recall were the original Breguet Alize, which quickly dropped the jet, and the Japanese built Neptune that used T64s and small home grown jet engines (a fuel seller’s dream, no doubt).
One final rambling: the downfall of the Hustler was a combination of really bad low speed handling and the all-too-common North American phenomena of an airplane company run by people who were more interested in raising money that building airplanes or running companies, and who had no hesitations about leaving the poor wage slave engineers in the lurch (huff huff). Been there, done that.