I have an issue understanding exactly what this is for. As it is, you could probably do this using the Control Variables and Conditional Branch commands to modify all of the variables based on what actors have what items equipped.
If you're looking for a script to make your life easier, it's probably not going to end well, seeing as it isn't something that is incredibly difficult to do with (common) events. It may be time consuming to do it with events, but it's no different when someone has to design, write and test the script they write. Don't mean to come across as being rude, but there's quite a few requests that are made for scripts that can be done fairly easily with events. Have to remember, whoever takes up the request isn't getting paid for it.