I'm not sure I understand all the requirements here. But I'm pretty sure you do not want MIP as the method.
You want outbound traffic from 192.168.1.1 to source nat to x.x.x.34
You want inbound traffic to x.x.x.35 to destination nat to 192.168.1.1
If this is correct, you want to use a DIP with a policy for the the outbound traffic and you can use policy destinaiton nat on the advanced tab for the inbound traffic.