2 ideas for upside down world.... a bit crazy, but we can dream.

Have the entire play field flip 180 degrees....... would also allow you to rock either playfield if you wanted....

Go with a windowed approach like haunted house.... but go with an LCD below it.... when game starts you can go to lower play field and play the lcd and it looks nice and happy..... then when upside.... all lights go dark (or begin to flicker in scary way) except lower playfield which Changes to upside down world..... you could get some really cool effects as it is essentially a video game.....

Other idea is that the LCD is flush to the playfield and at first is just part of overall art package. Get it to blend in. Then when upside down same as above.... graphics change, etc.....

I know LCD won’t be popular with everyone.

Lcd screen would be a virtual pinball playfield. Allows for cool animations like zen does....