LB HTTPS Reverse Proxy

That looks about right. This assumes that the client isn't making POST requests to the URIs with the template parameter. If they were, they'd get redirected and make a GET request to the HTTPS URI from the redirect.

Here are a couple of edits for the iRule:

when HTTP_REQUEST {
        if {[class match -- [URI::query [HTTP::uri] template] equals template_dg]}{
                HTTP::redirect "https://[HTTP::host][HTTP::uri]"
        }
}

Aaron