Move 7 segment display off board, how?
You've got machined pin socket on the board, you can buy a matching machined pin header, and piece of plated through matrix prototyping board and make a plug that fits that socket, and a socket that matches the pins on the LED display, then solder a piece of ribbon cable between them and plug it together. 

I generally buy this stuff on Aliexpress (because price),
but here's some Sparkfun links,

machined pin header   https://www.sparkfun.com/products/117

machined pin socket   https://www.sparkfun.com/products/743

matrix proto board https://www.sparkfun.com/products/8808

ribbon cable https://www.sparkfun.com/products/10649