Is there any tourism product that goes west from Lhasa along Highway 219 to Kashgar?

No, you can go to the local guide column, ask the guide and driver, they have carpooling and chartered cars, this is not official Ctrip, Ctrip just provides a platform for everyone to communicate, the following website, go in and scan the QR code, Download the Ctrip travel app, and after installation, there will be a local guide in the lower left corner of the home page. Welcome to click the green "Accept as best answer", thank you<br/>http://you.ctrip.com/events/

This kind of itinerary can only go with a chartered car.