Backorder Button on Collection Pages

I need a feature where the 'ADD' button on collection pages is replaced by a 'Backorder Now' button when inventory hits zero. This change is crucial to prevent customers from bypassing the NotifyMe Backorder Button and continuing to purchase out-of-stock items. The current two-button option is confusing and misleading, and a single 'Backorder Now' button would streamline the process for customers.