Raised a ticket with Waveshare support as suggested and they replied with:
"We are currently working with the AIDA64 team on firmware/image support for Waveshare USB Monitor products using the JPEG transfer protocol."
"For the 2.8inch USB Monitor, the AIDA64-compatible TF card image is still being confirmed/tested on our side. Once the correct image file is ready, we will provide the download link and update the Wiki accordingly."
Hopefully the wait won't be too long.