Create 2 different iRules for Redirection

Perhaps this:

when HTTP_REQUEST {
    if { [string tolower [HTTP::host]] ends_with "myownwork.com" } {
        HTTP::redirect "http://www.yourwork.com"
    } elseif { not ( [string tolower [HTTP::host]] starts_with "www." ) } {
        if { [class match [string tolower [HTTP::host]] equals domlist] } {
             host in the list - issue redirect to parent URL
            HTTP::redirect "http://www.yourwork.com"
        } else {
             host not in data group - redirect to self and add www.
            HTTP::redirect "http://www.[HTTP::host][HTTP::uri]"
        }
    }
}