I'm sure you can find a lefty on YouTube shooting a Scorpion, I'd start there.
Regarding the folding brace, I don't think it is useful to have the brace folded while carrying a Scorpion on a Sling. I personally would recommend not considering the side the brace folds on unless you intend to SHOOT the pistol with the brace folded. I never have my Scorpion out without unfolding the brace.
Bonus thoughts regarding the pistol braces:
I'm a little over 6 feet tall, and my length of pull is a little longer than average. So, the Tailhook brace, attached to the standard Scorpion folding arm, was too short for my preference.
The SBTEVO is still too short, but it is my preference over the Tailhook or an AR buffer tube with a sig brace.
I like he standard CZ folding arm because it's geometry allows the shooter to slide his face forward in order to raise his line of sight. However, I haven't found a brace long enough for my length of pull.
I like the AR buffer tube because it balances the firearm well. Unfortunately the cheek weld doesn't place my line of sight in the right place.
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