Can anyone make a stall warning code for this?

Try this...
Just need to figure out what you want your critical AOA to be that is the simulated stall and enter that AOA in degrees in the field listed in the vizzy.

https://www.simplerockets.com/c/LI9Jq4/Stall-Warning-Horn-Demo-Vizzy

Only small issue is that Juno does not model the actual stall, which is the separation of the airflow across the trailing edge of the airfoil at high AOA, but i guess you could pick a "Hypothetical Critical AOA" and write a Vizzy to trigger a horn when the craft exceeds the wing's lift vector AOA. I'm not the greatest at Vizzy, but I could give it a try. Would be a neat way to continue learning Vizzy.