Easily viable IMO.
Run a squad of 9, you can easily buff them to 4++ with Strategem when needed, add in virullient blessing, miasma of pestelence, a few supporting characters (such as DP, Spoilpox), the tree and you can wreak havoc.
The drones throw out so many attacks that they don't care about armour saves. With buffed to wounds and rerolls they are quite capable of taking down vehicles too.
The rest of your army should focus on capturing objectives. For this I would recommend Nurglings and Plague Bearers as points allow. (Don't bother taking anything less than units of 25 for the Plague Bearers as their utility is in their innate -1 to hit when they are at 20+ models)
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