Microsoft Dynamics 365
This is a good idea Matt! However let's also remember that we want to be able to change Business Closures per country so the final solution should be something that gives us flexibility with WH-templates, resources and Business Closures as a whole.
Project Service Automation
What would be a lot easier here is just making it so that a work hours template actually just had it's own calendar. Maybe give us the option to use a resource as the starting point but it should definitely have it's own calendar that can be viewed and edited independently