This wasn't for EMM, but on a recent Poly trip I was trying to be out front of the MK at 7:30AM, so roughly the same timing as EMM.
Walked up to the monorail entrance... delayed start.
When the monorail isn't running there is "supposed" to be a bus to MK, but at that hour, with timing being of the essence, I've always been too scared to trek to the bus stop, wait, what if it doesn't come, etc. I'm paranoid and worry about the monorail opening the split second I walk out of the Grand Ceremonial House on my way to the bus stop, and they waive off bus service, and then I'm sitting there like an idiot waiting! Unfortunately, I have generally found that communication of status to on the ground CMs isn't exactly the best, so I also worry about asking someone what to do.
Perhaps my concern above is unfounded, but personally I like Plan B options that give me more control.
On my particular morning, I went straight downstairs and started searching for a Minnie Van on the app. None were around at that moment, so we took a taxi to CR and walked over. Granted it cost me like $8+ tip, but well worth it as I made it pretty much on time with minimal stress. If DS had been smaller and needed a car seat like I know you do, I would have spent more time looking for a Minnie Van or Uber w/ Car Seat.
Another alternative from Poly is walking over to the TTC and taking the MK Ferry. It'll cost you the walk time over there, but it's not a bad Plan B or Plan C if things aren't going your way.
Sorry, long explanation, but hope that helps.