Exposure blending is just a way to retrieve details in highlights and shadows and merge them together by luminosity masks in order to make it all fit in 8-bit image formats. Not necessarily because of limitations of camera HDR's. The reason I had to isolate different exposures from the EXR is simply because plug-ins often aren't able to process 32-bit. Even Photoshop itself has very limited 32-bit capabilities.
Anyway, I didn't put too much effort in it. It's more of a study, 90% result in 10% time.