Can you add Chromecast functionality without using the ActionBar

I've been working from the example applications from Google to prepare our Chromecast capabilities,

What I've found however is that you are required to have a button in the ActionBar (as implemented by Google) in order to get an ActionProvider in order to attach your selector to.

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    super.onCreateOptionsMenu(menu);
    getMenuInflater().inflate(R.menu.main, menu);
    MenuItem mediaRouteMenuItem = menu.findItem(R.id.media_route_menu_item);
    MediaRouteActionProvider mediaRouteActionProvider = (MediaRouteActionProvider) MenuItemCompat.getActionProvider(mediaRouteMenuItem);
    mediaRouteActionProvider.setRouteSelector(mCaster.getMediaRouteSelector());
    return true;
}

Intact, the entire example and API seems to be hot-wired to centre around the use of this button. I'm fine with reproducing the look and feel the Android are trying to go with here - but I use a custom ActionBar in my app which means I don't have any "hooks" to select the route et al.

Does anyone know how to work around this?