3.18 Righteous Fire + Firestorm

Looking to compliment my RF Inquisitor build with Firestorm for some extra dps. Running RF with Swift affliction, Elemental Focus, and Life tap.

Trying to use Firestorm with lifetap, immolation support, Swift Affliction, Spell Cascade and Burning damage.

Would appreciate advice on what support gems to use, I know it's not meta but it's fun trying to experiment.