Is it possible to route traffic in an if statement to a single IP and port without doing a redirect?

Yes, this is possible. You can a an second pool with pool member 172.18.188.11:7777 and use a LTM policy to forward traffic to this pool when the URI starts with /wrongpath.

Or you could use an iRule like:

when HTTP_REQUEST {
    if { [string tolower [HTTP::path]] starts_with "/wrongpath" } {
        pool pool_7777
    }
}