The physlet graph applet is an independent applet. You can use it with any other physlet applets.
I just add UI interface to combine animator applet and graph applet.
But I have never used graph applet with E/M field applet. I think it could be done.
But I think it will be much easier to build what you want with EJS.
So I would suggest you try to build it with EJS. If you have difficult with it, write down in detail what you want and I am willing to help.