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With a topic_tools mux you can feed both inputs into a node and select which gets published out with a service call:

http://wiki.ros.org/topic_tools/mux

So instead of

node1 -> topicA 
node2 -> topicA
topicA -> node3

it would be

node1 -> topicB -> mux
node2 -> topicC -> mux
mux -> topicA  (which is a copy of either B or C depending on mux selection)
topicA -> node3

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