Yep, flathead is a great starting point. I'd say they will be the first fish to find your lure even if jewfishing. They don't really have a preference for lure shape, size or colour or retrieve which are things that can be a problem with jew (and also bream) so long as you keep in contact with the bottom (most important). Due to these things, larger and heavier lures can be used which makes flicking much simplier as you can feel your lure just that much better. They are also found pretty much anywhere in the waterway in shallow or deep.