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a) Part 135 Single Pilot Cargo, e.g. Ameriflight, Airnet, etc.
b) Part 121 F/O at a regional
c) Part 135/91 Charter
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The most useful time for what you want to do is 121 PIC Turbine, none of which you'll get from the above. You can get 135 PIC Turbine at Ameriflight pretty quickly in the Beech 99s and Metroliners; pilots have gone to UPS/Fedex from that. You could even get 121 Turbine PIC in the EMB-120 at Ameriflight. At Airnet you can get 135 Turbine PIC in the Learjes, but it'll take forever to get there. F/O at a regional, yeah 121 time, but not the needed PIC. Ameriflight and Airnet are 135 charter, there is no 91 charter.