Due to lack of native solution I present you Spaceman
It allows you to backup and restore workspaces of Photo, Designer and Publisher. There's also sync option if you want to have same UI in Publisher personas and standalone applications.
Spaceman is command line tool with very straightforward operation, backups are created in folder from where it is started.
Feel free to suggest further improvements and give me a shot if you found bug!
Edit:
There was a problem with compiled .exe so now I'm sharing .bat file instead (and also for peace of mind of @CLC )
