Hi @Seadog
You can try using the intellij as mentioned in this post - IntelliJ with command completion, syntax check/highlighting for IIQ rules (beanshell) - IdentityIQ (IIQ) / Show and Tell - SailPoint Developer Community Forum
Also, you can check the the plugin pub / sailpoint-plugins / Rule Runner Public · GitLab (identityworksllc.com) from Devin Rosenbauer’s team