Scuffed Incinerate of Venting PoB -- Need feedback please!

PoB - https://pobb.in/FNq34J6HQKFn

I'm a noob at build making. This league I wanted to play something specific-

1. Channelling skill

2. Spell skill

3. Fire skill

4. With a staff

Why you ask? No reasons for it, call it whimsy.

So I started looking for fire channelling skills and found Incinerate of Venting, which got some solid buffs this league like most spells. However, most spells got a mana cost increase, and incinerate was spared that for some reason.

The numbers on Incinerate of Venting looked good, so I started cooking a PoB. Turns out people play this skill and it dishes out a ton of damage. Most of the endgame builds on poe ninja have crit scaling/power charge stacking, which makes sense for high budget builds.

So I decided to make an ignite variant. I have a few loadouts in the PoB. Ignore all of them please, just Staff Ignite is the one I'm thinking on league starting. Tell me if I'm being a dumbass or something is going to be way too expensive/unrealistic.

My plan is to use this ignite variant and farm currency. Then switch to crit/power charge or chaos convert later.

Questions I have are-

1. Does this build seem realistic?

2. Am I missing something obvious?

3. Can I use Cast when Channelling somehow with frostblink or lightning warp or something else?

Appreciate any input.