WordPress development: define WP_DEBUG conditionally using cookies

functions.php

<?php 

/**
 * Sets a 'wp_debug' cookie for logged in WordPress administrators
 * In conjunction with a properly configured wp-config.php, it can enable WP_DEBUG mode conditionally.
 *
 * @link http://wordpress.stackexchange.com/questions/69549/define-wp-debug-conditionally-for-admins-only-log-errors-append-query-arg-f
 */
function set_admin_debug_cookie( $user_login, $user  ) {

	if ( in_array( 'administrator', $user->roles ) ) :
	
		setcookie( 'wp_debug', 'on', time() + 86400 );
		
	endif;

}
add_action( 'wp_login', 'set_admin_debug_cookie', 10, 2 );

wp-config.php

<?php 

// ... 

// Place this statement at the end of your wp-config.php file

if( isset( $_COOKIE['wp_debug'] ) && 'on' === $_COOKIE['wp_debug'] ) {

    define('WP_DEBUG', true);
    
} else {

    define('WP_DEBUG', false);
    
}

// ...

Is it possible to write a define statement in wp-config.php that only applies to one website in a multisite environment?

Basically like conditional instructions per website...

e.g. All of website allows for define ( revisions 3 ); but I wan't one of the website's in the multisite environment to have define ( revisions 10 ); that is setup for training.

Any help would be appreciated.