To acheive what I want, I just created a skill that has nothing in it but the usage message that I want for each state, and then force everyone with that specific state to use that skill. However, you said in your script that in order to use the script commercially, you would need to be contacted first. Would you let me keep the script or do I need to find another solution (if the script is kept, I will credit you)?
An option would be to post in RGSS3 Script Requests and see if anyone knows of another script which does this.