No replies to this so I got in contact with Proface directly. Here's what they had to say...
" SP5000 open box + GP-Viewer EX/RemoteHMI for Win would be the solution for the requirement. SP5000 Open Box is running windows OS, so it can be used just like a PC.Similar thing might be possible on other HMI model with the combination of RPA(Remote PC Access) + GP-Viewer EX/RemoteHMI for Win, but this requires extra license products. And as far as I know it has never tested before.At least there's no function like your original expects and normally creating duplicate screens will be better solution."Copy From Another Project" utility will help for that. Please refer to OLH 8.6.2.1 for instruction details. "