Dan Caton of Appalachian State University has tried a non-linear approach , driven by astronomy in the news, for several years. Taking such an approach is a bold step.
Numerous textbooks are available for either preference, and some are available in both formats.
The instructor must be willing to react to topics and research them as they come up. Once this background is established, we are ready to dive into the infinite possibilities the universe presents. Additional background can be provided as needed, and a standard textbook is used as a resource.