can you script layers to add art in acrobat

I’d like to import a small PDF or EPS art file to a page within a big PDF and add a different version of the imported art for different people who will recieve the file. I find I can do this using the import layer feature and then flattening the file before I save it. I'd like to use a script to do this. But I can’t find any scripting information about this under Applescript or Javascript for Acrobat Pro. Is there a way to script the layer feature to add a layer and put some art on it? I guess I should flatten it after this is done to reduce file size.