Launch AHK with key, then disable it until AHK is closed

I've written a little AHK script, I have NumpadEnter as my launch key, but also as my AHK execution key. I'm wondering whether I can execute the AHK using the key instead of Razer trying to launch instead.
[indent]I've tried using SingleInstance in the AHK script, but it seems the launch command of Razer is over-writing the scripts ability to execute.[/indent]

(if my explanation was unclear, I want to press [NumpadEnter] once to launch AHK, any additional times to carry out the script)

Any (preferably elegant) solution is appreciated!