It's certainly an interesting idea, but that would be a hell of a lot of drones you would need to dump out, and losses would probably be catastrophic (relatively speaking. They're drones, after all) even on a successful engagement. Eventually all of this would add up, no matter how inexpensive you make said drones, they are still going to be semi-autonomous military assets, and will cost much more than your standard subspace missile. How would you counter production costs, once serious losses were taken? And whats more, what would the drones do in the event the Shivans countered them with a REAL swarm of fighters? IIRC, Maxims don't handle shields very well, and your own guard fighters would have their hands full keeping themselves alive. Even barring successful retaliation, it would take a long time to bring down a Sathanas using said Maxims, even in numbers in the triple digits.
That said, if this was developed as an automated system for disabling and disarming Shivan Warships, and was used more situationally, it could be very effective.