You need a loopback connection to the client, attach notifiers to what you want to loopback in Renoise, and then send Osc messages to the client.
GlobalOscActions can not really do this cause we don’t know what the clients are interested in. We can not send loopbacks for “everything”.
See Osc Discussion (How Where What To Use Osc) for an example using Max and the track volume (from samBiotic)
You could also invent a message which sends a loopback on request only, like “/renoise/loopback_bpm”. All up to you. Nothing is standardized here…
Welcome to the fuzzy world of Osc. Everything’s possible, but nothing works (by default).