The guys at TL Ultralight in the Czech Republic did this about 5 years ago. These are the people that make the Sting, Stream, Sparker, Sirius, etc. and other aircraft in the range. They built about 20 units that were commissioned specifically for military training because they needed a low-cost way of operating an aircraft with a turbine engine for military training. Apparently, they couldn't do the same thing with a Piston engine variant. I saw some photos of the aircraft when I was lucky enough to go to AERO Friedrichshafen about 5 years ago. I will see if I can find the photos but it looked really nice. No idea of the price or anything else but it looked really good.
A quick search found this information
TL-Ultralight, a Czech aircraft manufacturer, has developed the Stream Turbo, an ultralight aircraft powered by the PBS TP100 turboprop engine. This engine is notable for its low weight and high static thrust, producing 241 horsepower (180 kW). It is equipped with autonomous oil and fuel systems, an electric BLDC starter-generator, and a digital control unit that maintains a constant propeller speed. The aircraft can reach flight levels up to 29,500 feet (9,000 meters) and has a maximum starting altitude of 19,700 feet (6,000 meters).
tl-ultralight.cz
tl-ultralight.com.au
The Stream Turbo's design offers pilots an experience akin to that of a military fighter jet, featuring tandem seating and a highly streamlined Kevlar-fiberglass composite airframe with retractable landing gear. While primarily intended for military use, the aircraft's performance and design make it suitable for basic fighter training, especially for developing world militaries. 20 units were commissioned for the Czech Republic military as a basic trainer aircraft.
pimaair.org
The PBS TP100 engine itself has applications beyond civilian aviation; it is also utilized in various military contexts, including vertical take-off and landing (VTOL) operations for unmanned aerial vehicles (UAVs).