Content Switch with Sorry Page

You could insert a check after the switch statement similar to:

if { [active_members [LB::server pool]] == 0 } {
    create data variables with HTML content to send to client
          set httphost [string tolower [HTTP::host]]
          set data " $httphost Sorry: The Site you are trying to reach is currently Unavailable. If you believe you are receiving this message in error, contact our service desk at XXXXX."
          send string
          HTTP::respond 200 content $data 

This should check for active members in the current selected pool and remove the need to check each individual pool in each switch entry