You can return to Kuwait to apply for the police certificate; OR
send a representative on your behalf to apply for the police certificate with the required documents listed below; OR
obtain certificates from a Kuwaiti embassy or consulate by providing the documents listed below.
Required documents are a copy of the passport you used in Kuwait, a copy of your old or expired resident visa in Kuwait, a copy of your current passport (if applying at a Kuwaiti embassy or consulate), a copy of your current valid resident permit (if applying at a Kuwaiti embassy or consulate), a fingerprint form, four photographs; and 10 Kuwaiti dinars.
Note: Fees are subject to change.
According to this he can also visit kuwaiti embassy in india and do the proceedings from there