CloudMQTT Bridge, Mosquitto & Owntracks

The way the bridge works is that it can be in either direction. So you can configure a bridge on your local MQTT server and it’ll connect to the external MQTT server. It doesn’t have to be inbound.

All you have to do is have your “master” MQTT server bridging to the other one or ones. You can even have it as a one way feed. It’s worth a read of this thread.