I figured it out...This is THE BEST way to escape the collision boundaries between your POV and the plane itself...to have a fully controllable, completely unobstructed fullscreen first-person view of only the landscape around you, without any weird zooming or misalignment.
Navigate to the Model folder of whatever aircraft you want to fly with. For example, we'll use the Volocity helicopter/drone style aircraft (example directory location "C:\Flight Simulator\Official\Steam\microsoft-aircraft-volocity\SimObjects\Airplanes\Microsoft_Volocity\model"). Right click the model.CFG and edit it with Notepad or Notepad++. Change the file to look like this:
[model.options]
withExterior_showInterior=false
withExterior_showInterior_hideFirstLod=true
withInterior_forceFirstLod=true
withInterior_showExterior=false
[models]
exterior=Volocity.xml
interior=Volocity_Interior.xml
I only changed 2 of the "true" to the two "false" that you see above. Making this edit will turn off the collision between your POV and the plane itself. Now load up your game and start a flight with the aircraft that you edited. Make sure that you're in the cockpit view. Rotate your view so that you're looking at the passenger seat, then press and hold the left arrow on your keyboard until your view leaves the front of the plane. Now turn your view back to forward facing, and you're flying first person as if it's just you and the sky. Enjoy!
NOTE: I've only tried this method with the Volocity aircraft, but I assume it works for all planes.