iRules replacing the destination IP

So none of this tested or even applied to anything, but I guess you'd create a network (standard) virtual server something like this;

ltm virtual vs_xlate_pub_to_priv {
    destination A.B.C.D:any
    mask 255.255.255.0
    profiles {
        tcp { }
    }
    rules ir_xlate_pub_to_priv
    translate-address enabled
    translate-port disabled
}

and then an iRule like this;-

ltm rule ir_xlate_pub_to_priv {
    when CLIENT_ACCEPTED {
         Append 4th octet of destination address to internal private range
        node "X.Y.Z.[getfield [IP::local_addr] . 4]"
    }
}

This seems awfully like putting your privately addressed hosts on the internet.....