Ford's Mobile Service did this update and it took only 10 minutes. To the OP, is Ford's Mobile Service available in your area? I highly recommend using this service!
I always use the volume control on the steering wheel!
By the way, I am amused that you want to remove the Pro Trailer Assist. I had a 22 Ford Maverick Lariat but I decided to replace it with a 25 Maverick Lariat...my number reason (there several other reasons too) was the Pro Trailer Assist...
The only time that I see SOC over 90% is when I charge the battery with my NOCO charger (I do have the ECO model). I think many ECO owners have the same issue.
From NOCO's website: The NOCO Genius 5 Repair Mode is designed for 12-volt lead-acid batteries, including AGM, to recover them from stratification, sulfation, or low charge by using a 4-hour high-voltage recovery cycle .