Add a WSD print via group policy

I have a new wsd capable printer. Users can just discover it on the local network and add it and it works great.

How can I push this out to these users with a GPO- so they don't have to discover the printer and add it themselves? I don't want to have to configure a Windows print server, I just want to have clients automatically discover the printer and add it.

I created a user preferences item like this:

I get this error on my workstation when the gpo is applied:

The user 'http://10.1.1.123:80/WebServices/Device' preference item in the 'printers_gpo {guid}' Group Policy Object did not apply because it failed with error code '0x80070709 The printer name is invalid.' This error was suppressed.

You're trying to use the URL to the printers built in webserver, which isn't a valid path. The GPP is expecting a UNC path.