Reply from TfL regarding fares on the southern ELL extension to Woolwich & Abbey Wood.
“In this case i am afraid that the only ways to make this trip are noted on the tfl website under alternate fares and if your desired trip is not there then it is not available. We are still in the process of updating our system to incorporate the Elizabeth line into our website and online tools (single fare finder) so this could change but for know these are the only available routes that allow you to skip zones 1.”