[kovidgoyal]

webengine-dialog is constant, you can override main, like this:

self.gui.job_manager.launch_gui_app('webengine-dialog',
    kwargs={
        'module':'calibre_plugins.scrambleebook_plugin.main',
        'func': 'some_name',
        'path_to_ebook':path_to_ebook,
        'book_id':book_id,
        'from_calibre':True
        }
    )

then replace main with some_name