Welcome to the forum, Nibbis Stormcloud! I wish you the best with your upcoming run.
As I see it, there are two basic ways of doing what you'd like to do. One would be to conceptualize, implement and execute a completely novel arcane battle strategy for SCS/Ascension. That would be hard. The other would be to study a spell book that you feel comfortable with, identify the spells that you really need, and the ones that are just there, and then explore the possibilities offered within the open/variable positions. That would be easy- or at least easier.
Let's take the latter approach, for the moment. I won't recommend a particular course of action. I'll just illustrate how I'd go about solving the problem.
Given my playing style, I'd focus on the defensive spells and spell book management. I'd seek to answer two questions: How will I keep myself alive, and how will I prevent myself from running out of spells? An answer to those questions might look something like this.
NW: I dashed this off super-quick and I'm not super-interested in debating the details. Just an illustration, folks.
1. Shield, PFE, ####, ####, ####
2. Invisibility, Mirror Image, Blur, ####, ####
3. ####, ####, ####, ####, ####
4. Stoneskin, Improved Invisibility, ####, ####, ####
5. Spell Immunity, Spell Shield, ####, ####, ####
6. PFMW, GOI, Spell Deflection, ####, ####
7. Project Image, Spell Sequencer, ####, ####, ####
8. Spell Trigger, Protection from Energy, ####, ####
9. Wish, Chain Contingency, ####, ####
That leaves us with a lot of options, actually, doesn't it? And now the question becomes, how will we kill stuff? Here we have room for creativity. At this point, I'd pick a theme, and then add offensive spells around that theme- mindful of the constraints provided by the game world. Some strategies just won't work, but a lot will. A lot. I think players underestimate the degrees of freedom here.
As for your stationary AoE based approach: could that work? Sure. Sounds interesting. Grease, Web, Stinking Cloud, Teleport Field, Ice Storm, Cloudkill, Death Fog, Sphere of Chaos, Incendiary Cloud, Meteor Swarm. You could probably just stand around and watch stuff die, in most cases. And adding demons to the mix, as you suggested, could be really cool- assuming your scripts behave. I'd love to see you make that happen. And I hope you'll post in the no reload challenge if you decide to give it a go. In any case, good hunting! And enjoy!
Best,
A.
PS: ToBEX offers a component which prevents spell disruption on zero damage hits (i.e.- hits where the caster has 100% resistance). It makes sense, and it would be a potential boon to a stationary AoE sorcerer. Check it out.