I haven't had luck with removing the display either and cracked a few while trying to fiddle with the touch display.
FYI - I like this board a lot and for my project I decided to just use the touch pins (1, 2) with the wires running to two separate rivets that I drilled into my chessboard to use as 'buttons'. I then cut a piece of plexus glass that feeds into the top part of the board and put the display under the plexiglass.
You can see some of it here at the 1/2 way point (1:42 in)
https://youtu.be/5S0z9_bPXYM