The procedure you outline is a good procedure to use if you have access to an established tank. When I set my 80 gal
up I did not 'cycle' the tank so to speak since i added the LR
from an established tank into this tank and added 10lbs of livesand from another established tank.
This is the same principle reguarless if its freshwater or saltwater. If you take something with established backtera in it and place in a new tank the established bactera will grow and spread into the new tank.
What I dont think you can do is to cycle a saltwater tank with freshwater bactera. I feel that types of tanks have such a different water chemistry that the freshwater bactera would probably end up dieing off creating an ammonia source for the saltwater bactera to start to grow.
I personally have not verified my hypothisis as I have not had any freshwater and saltwater tanks up at the same time.