OPEC+ is preparing to consider a significantly larger oil output increase at its meeting on Sunday, as escalating military conflict involving Iran threatens energy flows across the Middle East. According to sources close to the talks, the alliance could raise production by as much as 411,000 barrels per day (bpd) in April — three times the previously expected 137,000 bpd increase. One source suggested the hike could even reach 548,000 bpd if market volatility intensifies. The move would mark a sharp shift in tone for the group, which had…