Irule to see source IPs

Simply put, if you cannot access the layer 7 HTTP traffic, you cannot insert any information into its payload. And you cannot access the layer 7 HTTP traffic if you do not offload the SSL layer. You can optionally re-encrypt to the server, but you have to at least terminate the client side SSL at the proxy. The very best you can do in lieu of that is perhaps to insert the data into (layer 4) TCP header data using the TCP::option command, but then you'd probably have to add code to your applications to be able to see this data.