Session quota yielding

Hi, I am currently using a Loader to deploy a subsystem, and in order to improve dynamism, I would like to implement resource trading between the Loader session client and the server. For resource requests, this is pretty straightforward using a notification and the upgrade session facility. However, I would also like the loader to be able to spontaneously yield resources when they are no longer needed. I looked at the yielding facility, but it seemed more focused on direct parent/child trading. Is there a way for a server to yield back resources to its clients symmetrically to the upgrading protocol, ideally that doesn't require modifying the parent interface?

Regards, Charles