If you're changing rooms at all, irregardless of resort, you'll have to figure out your bags. What I would do is pack as much as possible the night before (or don't unpack much in your case), call bell services around 6:15 AM and have them come get your bags to either move to a second resort or hold for a different room category in the resort you are in, and then don't come back from the park until your new room is ready. Then call for your bags when you get into the second room. If you are switching resorts I think they say you might not get your bags until 3-5 PM, if you are in the same resort they will be available as soon as you get your second room. Then you aren't homeless for any period of time, you're just at the MK having fun and returning to a different room. It won't be that hard, since you won't really have to pack up much given it's your arrival night. The only hangup is if you wanted to return to your room earlier, like soon after EMM. Then you can't, because you probably won't have a room and if you switch resorts you won't have your bags yet even if you do have a room.