PBR using iRule

Hi,

I have a scenario where I want send traffic via a particular ISP based on source IP which I know I can do using when client_accepted, eg if source IP is 1.1.1.1 use ISP1 or is 1.1.1.2 use ISP2

When question, IS this achievable for inbound traffic (ie the return traffic) as this will hit the LC via a wildcard and just route back using the routing table and bypass the iRule

ISP1ISP2

      0.0.0.0 wildcard      
       LC
      0.0.0.0 wildcard with irule selecting ISP based on source 




       Firewall with public to private NAT 

Any ideas ?