What you have done is indeed remarkable and useful. In particular I think you went for the solution that fits the typical use case, which is to synchronize the systems periodically. A live integration would have been much more difficult and would have tied the projects at the hip and created all manner of integration issues going forward.

I think this type of solution has a long precedent in the financial sector, where disparate system frequently merge data sets together on a nightly basis. Kudos for seeing the simpler path and not getting distracted by the lure of building live integration.