I think what you are saying is correct. You can extend either end of the reversing loop through one turnout in your nearest crossover.?
What isn't allowed is to do that with both turnouts of that crossover. Doing that would cause shorts every time a loco or lighted car's connected, powered wheels bridged the gaps between the two turnouts of the crossover. Also, any trains taking the crossover would have to be clear of the reversing section on the other side. You probably would find that still limits you to shorter trains than you want.