Create a Child Theme, Plugin or Must Use plugin, and use add_post_type_support
:
<?php
/* Plugin Name: Add CF to CPTs */
add_action( 'plugins_loaded', 'add_cpt_support_wpse_116891' );
function add_cpt_support_wpse_116891(){
# See /wp-admin/edit.php?post_type=SLUG
add_post_type_support( 'SLUG-POST-TYPE-1', array( 'custom-fields' ) );
add_post_type_support( 'SLUG-POST-TYPE-2', array( 'custom-fields' ) );
add_post_type_support( 'SLUG-POST-TYPE-3', array( 'custom-fields' ) );
}
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