I am truly sorry, but there is no way to get the Circus Leaders Mask before the Romani's Mask. The Circus Leader's Mask can sadly only be used against the bandits if you decide to go back and escort Romani again.
But you can get that awesome hug again and again and again!
It's impossible to get the Circus Leader's mask as you cannot clip into the loading zone for the Bar, and you need Romani's Mask beforehand anyway.