Achieve the same consistency as 8 hour slow cooked inside skirt steak in a fraction of the time? I have a process that calls for a 6-8 hour slow cooker braising of inside skirt steak. 
The skirt steak becomes incredibly soft and the connective tissue adds a lovely gelatinous luxurious mouthfeel when large chunks of the skirt steak are served from it.

I want to replicate this in half the time. I tried with cooking approximately 15lbs of peeled inside skirt steak for 4 hours in a covered hotel pan with some water in the pan but while the steak was delicious it was not "fall off the bone" soft. 

What are commercial ways of cooking large volumes of skirt steak quickly retaining maximum texture and flavor?
Tough beef becomes tender because the connective tissue breaks down into gelatine in the presence of heat and moisture. This can be sped up considerably using a pressure cooker, so that's your solution. 

There are considerations to this: a pressure cooker that could take 15 lbs of skirt steak all at once would be very large, hard to handle, and possibly expensive. You would likely want to do it in smaller batches in a smaller cooker to make it manageable, but then you are creating a load of work for yourself. Whether the time saved versus the extra effort is worth it is something you'd have to think about.