One thing SE can do is just animate spells differently when on SMN by having a summoned beast actually apply the spell and it practically becomes exactly as SMN from FFIII-FFIX. Hellfire/Diamond Dust/etc were all just prettier Firagas, Blizzagas, etc. to begin with.

Either way, I like the SMN play style though it very much reminds me of what the original 1.0 THM used to be like (Fester is essentially Shadowsear with dots being tied to it's damage as opposed to low HP).