Spot Metering for CI 2009 EAc3 Option B

I am working on a project which is considering pursuing CI 2009 EAc3 Option B. I am wondering if continuous metering is required for this path or if spot metering would be acceptable. I know that continuous metering has been removed in the redline version of CI but I was of the opinion that spot metering would be more applicable to the calibrated simulation option (Option D). Another point, on this project major changes are being made to the building's central plant (basically everything to do with the central cooling plant is being replaced), lighting and space layouts. Essentially everything is changing completely excep the building envelope. Is option B even applicable in this case? The design team is pushing for option B because they want to reduce costs and avoid doing a full calibrated model but it is my opinion that given the number of changes the "retrofit isolation" option isn't applicable.