You can a coven list CAD and gain access to the PfP table, so Kill Team would use it too.
The issue I see with Grots is as you mentioned, their slow speed without the Raider. And as your opponent will have his team spread out, it'll take a long time to engage all of his units. Not to mention you'll be tryin to grab objectives whilst eating alot of firepower with no way to return it
"Whereas the duty of the Imperial Commander is either to seize or defend territory, the Dark Eldar make war only to steal. If, as a by-product of this, the are able to indulge their vile passion for murder, torture and other decadent acts, then they will joyfully do so, but this is not their primary goal"