Hi Michael — great post. I am PM for Stackdriver Logging at Google. Some thoughts: If you just want to take out AE log data to BQ and don’t need those logs in Stackdriver — then you need not pay for Stackdriver ($0.50/GB). You can stay in the Basic Tier and still export all GCP logs to BQ for $0.05/GB streaming (that BQ will charge — SD will not charge anything). It is mentioned in our FAQ in the pricing page: https://cloud.google.com/stackdriver/pricing
Hope that helps.