drminn's idea is a good one if you can register an Amex prepaid card with iDine. If not, why not consider the Chase Sapphire Preferred card which is always 2x on dining (uncapped, I believe, unlike the Freedom quarterly promo which is capped at $1,500)? At $4k per month restaurant spend, that would be almost 100k UR points per year (which you could combine with any Freedom-generated UR points on general spend or on restaurant spend during the quarterly promo for restaurants) without giving up the iDine cash back.