try asking the key duplicating specialist in Turf City, Huat Kee Autokey i think.
www.autokey.sg Call them to ask and confirm if they can duplicate and programme in a Vito key first... last year called up to check if they do it to my older VW they say can, went there then suddenly say cannot cos they only can do the newer VW Caddy only... so you better confirm with them first.