Pakistan has the groundwork for this, especially attritable UCAV systems. Systems like the Kratos Valkyrie draws on target drone and cruise missile technology. tbh, I think there are a few signs that Pakistan is already working on an attritable UCAV system.
The first step (IMO) is to enlarge one's target drones, which is happening (see Hadaf-HS).
From there, you start reworking the target drones into decoys, usually with a payload of some type (like an ECM jammer), that fly alongside your manned aircraft.
In tandem, you gradually keep developing larger airframes until you reach the 2-3-ton MTOW range, at which point you can arm the UCAV with a small munitions load (enough for 2-3 SDBs or AAMs).