1200 points wych cult

5 Wyches with Haywire Grenades in a Venom with additional Splinter Cannon
x6

Succubus with Agoniser
4 Bloodbrides
Venom with additional splinter cannon
x2

Half it for 600pts, well, 577pts

I was thinking of swapping the Succubi for Archon with shadow fields, but it loses any claims to fluff at that point

For 1800, thoughts are three Ravagers, bikers (I should have 18 available) and / or grotesques in a raider?

No fluff for the ravagers, but the bikers wear wyches suits, so are easily explainable as bike mounted pit fighters, the grotesques being pit beasts brought on a raid, but then how to babysit them with an IC?

Anyway, thats a long long longer way off,

you could say that your succubus is a high level beastmaster

Also the Ravagers can be wych run. Powerful Cults do have such a thing. Or use the planes, as the planes are really wealthy Reaver pilots

As for a list... I think you could stand to lose a troop choice for a Ravager. You should atleast have 1 Ravager for long range AT at 1k (heck, I take two)