iRule to update an independent web page

Just brain storming here...you could serve the page locally on the BIG-IP with a unique URI such as /memberStatus. As your pool members are used, you could check their status in the LB_SELECTED event with LB::status, then store member IP:port and status in an array that you could iterate through for a page display with HTTP::respond. It won't be exactly real time, and will depend on all your pool members being utilized, but it's a start.