Modify parameters of register_post_type

Hello,
I’ve a theme with a plugin provided by theme developer for manage portfolios section.
This plugin create a custom post type with this code:

//Portfolio post type
                    register_post_type('wyde_portfolio',
                                array(
                                        'labels' => array(
                                                    'name'                      => __( 'Portfolios', 'Wyde' ),
                                                    'singular_name' => __( 'Portfolio', 'Wyde' ),
                                    'add_new' => __('Add New', 'Wyde' ),
                                    'add_new_item' => __('Add New Portfolio', 'Wyde'),
                                    'edit_item' => __('Edit Portfolio', 'Wyde'),
                                    'new_item' => __('New Portfolio', 'Wyde'),
                                    'view_item' => __('View Portfolios', 'Wyde'),
                                    'menu_name' => __('Portfolios', 'Wyde')
                                        ),
                                        'public' => true,
                                        'has_archive' => false,
                                        'rewrite' => array(
                                                    'slug' => sanitize_title( $portfolio_slug ),
                                        ),
                                        'supports' => array( 'title', 'editor', 'thumbnail'),
                                        'can_export' => true,
                            'menu_icon' => 'dashicons-portfolio'
                                )
                        );

I’d like to add the option with_front => false in rewrite, in order to put all the permalink in the root of my site. So I had to change the rewrite with:

'rewrite' => array(
       'slug' => sanitize_title( $portfolio_slug ),
       with_front => false,
),

I don’t want to change the plugin file cause I will loose the change at every updates.
Is it possible to add that option later, for example in function.php of my child theme?

Reading the register_post_type documentation it seems that is possible modify the post type (A function for creating or modifying a post type).
I’ve tried to simply add this to my function.php:

register_post_type('wyde_portfolio',
                                array(
                                        'rewrite' => array(
                                                    'slug' => sanitize_title( $portfolio_slug ),
                                                     with_front => false,
                                        ),
						)
                        );

but it doesn’t work.

I’ve tried also to redeclare all the params in register_post_type but it still doesn’t work.

Do you have any suggestion on how I can solve it?

Thanks a lot in advance