The only sort of consolidation I would have done with regard to BLM is to just replace Fire/Blizzard 1 with Fire/Blizzard 4 while Enochian is up, and actually allow those spells to affect Astral/Umbral like their tier 1 counterparts would.

Yes, it would simplify the rotation and make BLM more powerful on account of never having to use Fire 1 just to maintain Astral during Enochian, but that's really about all you could do that I can think of to consolidate the spells without drastically changing their effects.