Is it possible to “save” the settings for using the PMS GTN750 each time instead of using the default GNS 430/530?
That type of information could be stored in the planes “state.cfg” file in your user profile. Carenado may not be storing that information though. In essence you need to define a local variable that will contain the simvar you wish to make persistent, and this needs to be in the systems.cfg as well as the .flt file you spawn in with i.e. runway.flt or apron.flt. When you end a flight this variable is then written out to the state.cfg file.
Since its a marketplace plane that would be tricky, but perhaps not impossible. I’m not sure if the VFS software can expose those cfg files or not as I’ve never used it, but if it did this could be done via a mod I expect, but it would be easier if Carenado did it for us! 
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