Use clamp energy meter data in Energy until utility data is available from opower?

I recently discovered that the opower integration can pull the recorded energy usage data from my electric utility, it’s just delayed by a few days. I’ve had a Aeotec clamp meter on my electrical panel for years, so I’d like to continue to use it for real time consumption, but as the numbers it captures are slightly off from what my electric utility records, I’d like to switch to using the numbers from the opower integration once they are available (e.g. two days delayed). I tried setting up a template that compares the values of AEOTEC vs OPOWER, but that appears to only be the current data, which will always be the AEOTEC. Is there a way to get it to run against the historic data?