So I tested it and you can actually use another account on the same computer and have a completely fresh stat sheet with the same unlocked commanders you have on your main, so long as you allow the family share access thing for your other account. However, you will be missing bulletins that were unlocked on the main account as well as not have access to the few commanders that actually require an in game level to use.
At the end of the day it doesn't really make a difference, given enough games the new account will reach the appropriate MMR. Unless that individual continually kept making new steam accounts to enjoy the 4-5 "face roll" matches until they are at the skill level they are meant to be at.
