I can't see it being a problem. There are already "elemental" things in D&D that don't fit--electricity, "thunder" or sonic", etc. "Radiant" might as well be an element in some ways.
When I've done alternate divisions, the thing I usually run into is where to set the boundaries on the water/ice divisions. For example, I've used fire/ice, wind/stone, storm/wood, light/dark before, and made it work. (Yes, I know that storm/wood looks out of place, but I'm simplifying for sake of a shorter answer.) I mainly went with lightning/thunder in "storm" and left the pure high winds part to "wind", but that was me doing a home brew idea, not trying to model another source.
I think you get those kind of ideas no matter where you set it, and it isn't as if the base D&D rules don't already have them.