The EyeX Framework is provided with full source code in the SDK package. You can make it work with LabView by a minor change of the event creation implementation. The data stream events are created with a null source value because of the null source value provided by the EyeXHost in the method
By providing a non-null object here you would get events created with a non-null source and should be able to handle the events in LabView.
This change would result in non-null source values for all kinds of EyeX data streams.
I will also take this issue as feedback on the EyeX Framework to consider for future improvements.