Install
This is the repository archive. It installs, but the folder name will carry the branch suffix and updates will not flow.
Install straight from GitHub with WP-CLI:
wp plugin install https://github.com/vanbess/plugin-woocommerce-custom-backorder-message/archive/refs/heads/master.zipNo built-in updater. New versions won't appear under Dashboard → Updates. Install new releases yourself, or let Git Updater track the repository.
PLUGIN: Custom Backorder Message for WooCommerce
As the title says: displays a custom backorder message for products which are on backorder.
NOTE: this is a bespoke plugin created for a client, so will likely need modding to work for your use case.