iRule for maintenance page

I need an inline (no HTTP redirect) long maintenance page for a particular website, and I want to get around the bug in "LB_FAILED" (ID 222034). Below is a cut-down version of my code:

when HTTP_REQUEST {
    switch -- [string tolower [HTTP::host]] {
        "www.example.com" {
            pool www.example.com_pool
            set selected_server [LB::server addr]
            if {$selected_server == ""} {
                 If there are no members available, generate a long Maintenance Page
                HTTP::respond ...
            }
        }
        "www.example2.com" {
            pool www.example2.com_pool
            ...
        }
    }
}

Will anybody comment on whether this will work, or if there is anything not right here, or if there is a better way to achieve the same effect?