Holy Paladin - is Lightsmith viable?

Now, I know "everything is viable in HC and low keys", but still. Outside of Delves, Lightsmith is never recommended. The gameplay interests me more than Herald and I want an alternative to my PresVoker. Is it fine to play Lightsmith or would I just make things much harder?

Edit: thanks for all the answers! I'll play around with both and see what feels best for me. :)