The Bae 146 never did get properly approved in gravel kitted form. To my knowledge, only one ever operated on gravel - in private category for a Saudi Prince. Where anything goes. There was a gravel kit for the B732, but with 1200 m that aeroplane can't go near LNV either. So, unless they seal the runway, and do a lot of work to widen the side strip areas, it's a Dash 8 or similar for the foreseeable future.