<?php

add_action( 'init', 'overrides', 1 );

public function overrides()
{
    global $wp_filter;
    
    // get all callbacks from the hook 'woocommerce_account_gift_registry_endpoint' with a priority of 10
    foreach ($wp_filter['woocommerce_account_gift_registry_endpoint']->callbacks[10] as $callback_function => $registration ) {
    	// check if the callback function contains the hooked method class
        if ( strpos( $callback_function, 'addify_gift_registry_endpoint_content', 32) !== false) {
            remove_action( 'woocommerce_account_gift_registry_endpoint', $callback_function, 10 );
            
            // override the default function of the hook to the function 'my_custom_func'
            add_action( 'woocommerce_account_gift_registry_endpoint', 'my_custom_func', 10 );
           	// re-route which hook should the callback function run
            add_action( 'woocommerce_account_another_endpoint', $callback_function, 10 );
        }
    }
}