It therefore has 74 buttons and a screen with a length of 108.5mm by 94mm.
I would like help to know which screen to take and which arduino.
For the software to make it work in Microsoft flight simulator I use axis and ohs.
Suggest you jerry-rig something to a similar form factor.
If this was me, I would use two (2) 44 pin IR remotes for the switches, remove the bezels and solder wires to the pads then to individual switches.
You would then only need two GPIO pins to get a switch press into the Arduino.