Right on!
Variety and different sizes and feeding intervals.
It's not rocket science if you look into the biology of your animal.
I wouldn't be concerned about Salmonella in the slightest. Snakes will sometimes eat dead and rotting prey if they are in a bind.
The amount of acids in the digestive system of a snake will overcome almost anything.
I've fed my dogs RAW food and bones for nearly 20 years and have never had any situation with chicken to warrant concern with them.
Mix it up and enjoy!