forward traffic to multi pools and add x port to original port

Okay, so I'm not accounting for how you make a pool selection here, but the following is a very simple way to choose a pool member and then forward traffic to that member on a derived port. This assumes of course that the pool members are all listening on multiple ports and that the VIP is listening on multiple (all) ports.

when HTTP_REQUEST {

     select the pool (your pool selection will differ)     
    pool pool1

     force an early load balancing decision and store the chosen server IP in a variable
    set srv [lindex [LB::select] 3]

     direct the request to the chosen pool member on the derived port (1[TCP::local_port])
    node $srv:1[TCP::local_port]
}