Extensible code

Provide a filter:

$my_item = apply_filters( 
    'plugin_name_item_args',
    array(
        'post_title'   => $item->get_title(),
        'post_content' => '',
        'post_status'  => 'publish',
        'post_excerpt' => $item->get_description(),
        'post_type'    => 'post'
    ),
    $item # pass the $item object to the filter
);

A plugin can change these values now with:

add_filter( 'plugin_name_item_args', 'another_plugin_filter', 10, 2 );

function another_plugin_filter( $args, $item )
{
    $args['post_type'] = 'page';
    return $args
}