So you can have traffic. Come in on any of the ips. But send it all
out one router.
I'm still a bit baffled as to what real world problem this is supposed to solve. It's odd enough that you appear to have two IP subnets overlaid on the same physical ethernet, but now you're forcing both an asymmetrical route and an extra network hop.
If you don't mind us asking, what is it that you really want to accomplish? I suspect that there may be a better/easier/less weird answer.
