Who's this "we"? Do you have a mouse in your pocket?
Move your script to
~/scripts. Adjust the path in your Gcode System Command to
/home/pi/scripts/myscript, for example. Adjust the rights of the file with something like
sudo chmod a+x ~/scripts/myscript to make sure it can run. Make sure that paths inside the script have full paths instead of assuming that anything is in the path or that you're in a certain directory.
You'll end up with something like
OCTO900 which runs your script. You want to make sure that nothing in the script is blocking. If so, append an ampersand at the end of that line so that it runs in the background.
I do something similar and then I add
OCTO805, for example, in my Gcode scripts to alert me that the print job is done (playing a sound event which is R2D2's whistle).