Copy (or GP deploy) custom page sizes between computers?

Hello,

I own an iPF770 plotter but this question probably goes the same to any other Canon printer:

I've created a lot of custom paper sizes inside the printer's driver settings (Printing preferences -> Page Setup tab -> Size options).

How can I copy these page sizes to other workstations in our office?

We've already tried the Group Policy on our server, but custom pages don't get distributed, just the basic printer settings.

Any ideas?

p.s.

After the printer gets distributed by GP, I've found a new registry entry on the workstations:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Print\Providers\Client Side Rendering Print Provider\Servers\our server name\Printers\{06F2582B-D1C6-41E7-B191-E167A897FFEE}\DsDriver\printMediaSupported

All custom pages show here, but they are just names, not actual printer settings...