A media company runs a real-time summarization service on Amazon Bedrock using Anthropic Claude on-demand invocation in us-east-1. During a live event, request volume spiked to roughly 3x the normal peak, and the application began receiving frequent ThrottlingException errors even after implementing exponential backoff with jitter. The team confirmed their per-account requests-per-minute and tokens-per-minute quotas in us-east-1 are already at the maximum granted by AWS Support, and they cannot commit to a fixed monthly cost for Provisioned Throughput because the traffic is highly unpredictable and event-driven. They need to increase sustained on-demand capacity for these bursts as quickly as possible without a purchase commitment. Which approach best addresses this requirement?