JavaFX 2.0 :: Launching Application In Separate Plugin

I have the following problem:
 
Let's say, there is a simple Java application. It could either be a Swing or JavaFX or a plain Console application.
 
Then there are kind of X plugin jars which can be also on the classpath.
 
The main application (e.g. main.jar) scans the classpath for classes, which implement an plugin interface. For each found implementation it invokes some method on the interface.
 
The interesting part now is, that upon calling the interface method, some plugins may want to popup a JavaFX window.
 
And the problem is, that I can't just call Platform.runLater there, because of "java.lang.IllegalStateException: Toolkit not initialized".
 
And if I somehow manage to call Application.launch() (when? where?) in the plugin then there's the danger, that the second plugin gets "IllegalStateException: Application launch must not be called more than once"

I also don't want to call launch() in the main application, since it is not necessarily an JavaFX application.
 
Do I maybe need to start separate JVM in the plugin? Could it still communicate with the original JVM then (main.jar)?