We'd probably need to reverse the order, as we know daemon primarchs can't be enlightened, as they're too Warp aligned.
The issue I see is that most greater daemons are probably very wary indeed of going anywhere near Colchis. After what the Shard of Winter did to Kairos there it would probably seem very ill omened.
In terms of intrigue focused characters, we could try recruiting a Harlequin troop. We may be able to create a device that shields them even more from Slaneesh than Cegorach can manage, allowing them to use more of their true power.