Disney is getting tougher to beat on this. They now have Magic Bands (or as i call them "Tragic Bands") & Resort Room keys with embedded data. When you stay at a Disney Resort you get these.
Anyone can be IN the Park during EMH, but to ride a ride you have to verify (in line) with your room key or Tragic band. Last time I was there this was just visually by a "Cast member" (he or she just looked at the room key, but didn't scan it), but I am concerned they will soon scan the Bands and Room keys (via the FastPass+ system)?
Now a Disney "Tragic Band" & Disney resort room key knows your check-in & out date. I don't know if the Swan & Dolphin are scan-able by Fasspass+. Or the Hilton across from Dowtown Disney (which also gets you EMH, btw), for that matter.
Now if another hotel that participates in EMH does has a room key that that is not scannable (with check-in and check-out date data) you may have a shot.
EMH are better than nothing, so why not go to Tragic Kingdom at midnight when all the other parks are closed, right.?