Changing the in / out point on multiple clips at the same time

I am looking for this exact solution.

I have 213 videos, each with a slate/countdown that I need to strip out and recompress for streaming. I would like to make a preset that would start each one at 50s. Currently I am importing 10 at a time into Media Encoder, dropping a preset from the browser, opening the preset window from the Queue, entering 5000 to set the playhead, and pressint "i" to set the in point. RInce and repeat. 

Is there a way to automate this? In a perfect world, I would set up a watch folder and have this inpoint set and rerender auto-execute.

Is each clip exactly the same length? Otherwise, how would you imagine this working? This does currently work...kind of, but I don't recommend it. I took two clips of different lengths (three and 90 minutes) and set the out points to 30 seconds. I was able to verify by clicking each one individually after that both had the 30 second out point, but making any new alterations or simply closing the Export Settings window, then going back in, or trying to select both and make a new out point produced inconsistent results.

The time spent opening the Export Settings window, which does take a couple seconds, and verifying your out points are properly set would likely take much more time than creating a Premiere project, quickly setting your out points and verifying with audio that they end exactly where you want, then batch queuing to AME would be faster than trying to do this all in AME.