I think that would clash with the way officers decide how large your DP share is at the start of a battle.
This already happens with the second popular use of Automated Ships, spamming Gamma Core Glimmers.
Largely mirrors my thoughts, yeah. One thing I was thinking is perhaps AI cores could cost based on the cost of the ship they're in. The derelicts having no cost I think might just mean "you only use the largest one". Their impact on DP would need to be adjusted, though (which, I mean, fine - can't trust them for tactical advice!)
Only using the largest one would still have the inherent limitation of Ramparts being all-around 'far worse Dominators' (point for point when deploying them in battle), off-set only by the power of whatever AI Core you install in them. Without Cores, they're really kind of bad. I really wouldn't mind if Derelicts being free to the AS limit came at the cost of Cores contributing less to battle DP, given that Automated Ships already somewhat treads on the value of Officer Management.
The medium ones might still be appealing for a player who wants to deploy a couple destroyer-sized frigate-priced distractions with maybe Gamma or Beta cores, given that the Berserker can fit a lot of firepower for it's cost (especially with s-mods) and the Bastillon has some limited potential as a PD escort drone. Either way if someone wants to fill out their fleet limit with cheap little spammable Domain Drones, it wouldn't exactly be an efficient/powerful use of that limit anyways compared to just bringing some high-end frigates.
What if they all got... Rugged Construction built-in?
This and the blueprint idea would both be cool!
Overall: I don't want to make these drones statistically better in battle, at least not in any way that'd affect how the AI uses them, I just want them to be be somewhere close to a viable option for the player. I came to the thought of 'free vs AS dp limit, barring the added cost of AI cores' because you're still choosing to use a tier 5 skill to bring sub-par vessels into battle - mitigating the benefits of the AI Cores you use in them, while leaving you with just crappy un-officered (though uncrewed) ships for any drones you don't install cores in.