It can be incredibly difficult to move the K1 visa to a different embassy but it can be done.
Currently K1 timelines for Australia can be found here:
A member who filed February 2022 had their interview in November 2023…
Another member filed in April 2022 and had their interview in November 2023.
Latest timeline December 2022 filing and interview February 2024.
Add another 4 months to the process if trying to move the interview location- although it can take longer.
Process for moving K1 visa here:
If you are requesting a transfer for a K Visa, the receiving Embassy or Consulate has the discretion to approve or deny the acceptance of a K visa application from an applicant outside the consular district. Contact the potential gaining U.S. embassy or consulate in writing to request a transfer of your case and include the reason for the transfer request. If you paid the MRV fee at the original post and the transfer request to a new post is subsequently approved, a new visa fee will be required.