Contivity 1050 NAT for identical LAN branch office tunnels

[neo80017]

I have a Contivity 1050 in the central office. I have two Linksys BEFSX41 devices in seperate small brach offices, and have successfully created IPSEC tunnels. I am creating a test environment where the two branch office will have the same local LAN (i.e. 192.168.50.0), and therefore I'd like the Contvity 1050 to provide, what I would call, a one way static NAT. I cannot find any documentation for this scenario. Everything I've found references a Contivity at both ends with a bi-directional NAT.

Has anyone done this or something similar?

Thanks

Dennis