Forwarding Accounting Requests

Hi, I am looking to have FreeRadius forward accounting stop/start packets to a third party device. I understand this can be done by configuring the proxy .conf. The problem has to do with how the accounting requests are forwarded. In other versions of Radius it is possible to forward accounting packets with an attribute setting that ensures the forwarding server doesn't listen for a response. I would like to set this same configuration in FreeRadius but it doesn't appear that this functionality. Is there a way to forward accounting request packets (start/stop) without requiring the forwarding server to listen for responses? Thanks in advance.