There is a place in
MDE to unlock the door with your phone, it’s in the my resort section, same place you see your room number, check bus times etc. So as long as you’ve done online check in, you should be able to use your phone to open the door.
Also, since you’re CL, the CM desk on the 4th floor may have your bands. I’ve always had mine shipped so I’m not sure how it works for that, sorry. But as long as you arrive between 7 am - 10 pm, you can go right to the 4th floor CM desk for check in. You use the regular elevator & don’t need your MB to get to the CM desk area.
Edit to add: Even if they don’t have your MBs, they can give you key cards til you get them.