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I am not sure I exactly understood what you wanna do. But here is a suggestion:

First when you announce your publisher, specify 0 to avoid missing a msg (infinite queue: WATCH OUT! This can be dangerous..). Like this!

ros::Publisher msg_pub = nh.advertise("new_topic_name", 0);

Then just do this inside your callbacks:

msg_pub.publish(new_msg);

I am not sure I exactly understood what you wanna do. But here is a suggestion:

First when you announce your publisher, specify 0 to avoid missing a msg (infinite queue: WATCH OUT! This can be dangerous..). Like this!

ros::Publisher msg_pub = nh.advertise("new_topic_name", 0);

Then just do this inside your callbacks:

msg_pub.publish(new_msg);