Zebratula flavonigra as identified by Matthew Connors on the Australian Orthopteroids Facebook page: https://www.facebook.com/groups/australian.orthopteroids/posts/2565438777135099/
Well sourced Helen. There is a photo in Dave Rentz's grasshopper book (P 224) but nowhere as good as yours. It appears to be the first grasshopper species for the Kimberly NM an area where there is a wealth of endemic Orthoptera.