I don't think this is a problem with implementing a solution in LTM configuration or iRules--it's a problem with identifying what content you want served via HTTP and which you want served via HTTPS, and then coding an iRule to handle the different references the application might have to HTTP and HTTPS. A poster in the "Mixed noSSL/SSL site" post was able to do this for his specific scenario.
I'd suggest you reproduce the configuration in a test environment or with test VIPs and then use a browser plugin like HttpFox for Firefox or Fiddler for IE to determine exactly which references you want to rewrite and where. Once you figure that out, we can help you implement the logic in an iRule.
Aaron
Nimbostratus
