You can monitor with any wireless sensor with a wired input. The RE101 should be fine. However, note that if you only have a N/O contact, you would need to use a Relay to get a N/C output for the sensor. I am not aware of any wireless transmitter which would accept N/O.
To use N/O directly, I believe you would need to get a wire one way or another back to your Concord, because you would need to hardwire to the panel zones or use a wired zone extender.
What are the electrical specs of the N/O contacts? It is probably safe to pass 5-12VDC across to trigger an RBSNTTL, which would in turn trip a N/C output.