Yes, you can do that, and you don't need to do a trunk port. You just need to enter a static route on your router (or layer 3 switch) so that anything to 10.50.50.0 255.255.255.0 will be routed to your SA2000 IP address of 10.1.1.1
If you are using Cisco equipment, the config would look like this:
ip route 10.50.50.0 255.255.255.0 10.1.1.1
It depends on your network and router design as to where that route would go.