“Connecting a new display will require you to feed the cable through the printer”
Well, it’s actually not too complicated, you don’t need to take any additional parts to do it. Just take out the display (also need to unscrew two black screws inside, first and then grounding cable) and pull the cable out (do it a bit harder as it’s tight), and then when you change the display, feed the cable through by using different path.
In terms of finding the display, it’s not easy, as hp doesn’t sell it. You are may be lucky to find it on eBay…