There has been no changes to the functionality of the software as forked, so all the extensions compatible with WooCommerce 3.5.3 should still be usable provided they do not rely on Jetpack or WooCommerce Services.
However, many plugins and extensions check for the existence of woocommerce/woocommerce.php in the plugins folder prior to their activation. To circumvent this issue we have created a special compatibility plugin called “CC Compatibility for Woo Addons” which can be downloaded from the link below. This plugin cannot run on the same site along with WooCommerce, so you will need to delete WooCommerce completely before installing the compatibility plugin.