PoE Occultist, Cast On Critical Strike, Nova builds

I have pretty much everything I need to swap to LL except a belt. Crystal belts with 14% cooldown recovery seem to be absurdly expensive, so I'm trying to craft my own. I really only want a decent ES roll and 14%+ CDR on it (I'm already overcapped on res except chaos), and anything else is just gravy. Anyone have any idea how I would go about crafting this? I already have an ilvl 85 shaper crystal belt. I currently use Ice Nova of Frostbolts in my main CoC link and Frostbolt in my Cospri's. I see a fair amount of people using

Looking for input on the following build. I filled in a passive tree and added the mandatory items I know of. I'm going for a Low Life Occultist that uses cyclone+CoC+cold dot. From how I picture this... 1) cyclone crits and causes cold snap to proc. cold snap generates frenzy charges. (inner conviction on passive converts frenzy to power charges which boost all spell dmg). 2) I hand cast vortex which is the primary damaging spell in addition to cyclone. 3) Cospri's Malice auto casts ice spear, frost bomb and vaal ice nova. 4) I've taken 2 curses - frostbite and elemental weakness whic