EZSkin has an additional script installed which is called Nodegrabber.

This script allows you to make an XML file which you can then use in EZSkin2 as a Special Effect.

It is in an experimental phase, but it works well. Unfortunately there is no documentation for it (yet). But it is not so difficult to figure out.

Here is what I remember:

You make your blend setup in simple node setup (preferably only with the nodes you need for the blend with image map). Then in the script you select which input node of the blend node is the effect and what type of map the blend is for (diffuse, bump or other)

Then you press the button to create the xml file and you can import it in EZSkin2.

It has been a while so maybe I am missing a step. But with a little experimentation you can get it done