Bidding response to convenient minor bid
The Convenient Minor as a forcing bid is a prohibited agreement in North America (ACBL Jurisdiction). To get caught regularly responding to it with less than 5 points will result in severe disciplinary action by the ACBL.

If you are not playing in North America, you must refer to the agreed conventions and agreements as per your national authority on the rules. In most countries such unusual agreements are typically prohibited except in extended team play competition, just as in North America.

Update
ACBL Convention Charts (pdf)