In my former life as an aircraft mechanic, our airplanes used what is called an Air Cyle Machine. Look on Wikipedia for an explanation. Basically it uses high temp - high pressure bleed air from the turbine engine compressor and cools it and then allows it to expand, which results in a cooling effect. Maybe you could do a similar thing with a turbocharger and an intercooler and then allow the expansion.
Sounds like a lot of work!
Best regards
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