Adding Speed Dials in Bulk to multiple devices

I have 150 Polycom E220 phones that are used as "Common Area Phones".  I would like to add a speed dial to all of them for the IT Helpdesk.  I can import the lines for a single device, but I haven't been able to locate a way to import a speed dial to multiple devices.  (The templates don't seem to fit this use case)

Any help would be appreciated (even if it's I need to stop looking and do them 1 by 1)

Thanks!