I haven’t had time for this yet, but the intention of Concentratord is to be protocol agnostic. In case of the ChirpStack Gateway Bridge, it will forward the Concentratord messages as-is over MQTT. My plan is to also implement an UDP forwarder front-end for the Concentratord. If that is ready, I think it makes sense to include this in the GW OS images.
This would also allow you to run the Chirpstack Gateway Bridge and the “UDP forwarder” simultaneously, or even multiple “UDP forwarder” instances simultaneously, obsoleting the multiplexer