Fastpass during start of PM EMH window

I know that you can’t book FP during EMH times, but if I had one for 9:00-10:00 on a day with 10pm regular close and 10-12 EMH, would I be allowed to enter and use the FP at around 10:05 or 10:10? Planning to see Once Upon a Time which ends right at 10, and wondering if I can still make it over to Peter Pan or Haunted Mansion right afterwards if I were able to grab a same day FP?

I’m pretty sure that the FP+ line was shut down at the time it changed to Evening EMH - at that point they are scanning Magic Bands for line access to ensure that only those entitled to EMH are riding.