Yes.. in fact it seems like it would be pretty easy.
The entire backboard of the playfield is the wall with the letters painted, and each letter of the alphabet (which light up) sending you messages. Maybe a couple lamps scattered through the playfield that light up really bright. The xmas lights could be embedded into inserts, and the show movement of people in the underworld.
The underworld is an exact copy of the real world, except it's dark, and full of webbing, and those diseased green snowflakes falling. You could have a shot where you enter the underworld, the GI goes from bright white to dark green, and you're stuck there until you rescue whoever. The pro just gets GI, the premium/LE gets the snowflake effect.
Since eleven can make things happen, it could be done with magnets (like the shadow), maybe when she has her freakout and the walls crumble, that's when the shaker motor turns on to finish the effect.
The monster's heads remind me of those origami things you folded as a kid where you choose numbers and it tells you your fortune. I think there should be that mouth somewhere that's really subtle that you don't notice until the first time it opens up and screams at you.
The main theme would be the primary background song, but it could pull some of the other 80's songs (particularly the clash)