You can use FontAwesome and Shortcodes Ultimate together. The only difference is that you’ll need to enqueue FA stylesheet yourself as it was removed from SU.
Do not worry about conflicts as SU now uses its own CSS classes for icons. Actually, countless conflicts were the main reason for this change.
Add the following snippet to the end of the functions.php
file of your active theme:
add_action( 'wp_enqueue_scripts', function() {
wp_enqueue_style( 'font-awesome', '//netdna.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css', false, '4.7.0', 'all' );
} );