Not sure I follow, are you shooting the grapple gun at the drone or is it shooting it at you? Seems like it'd just be easier to port the costs for a winch over from Arsenal
My rigger is shooting the grapple gun (build into his cyberarm) at the drone. It's a VTOL drone and capable of hovering. I figured it would be faster to just shoot at it and get drawn up, while the drone can already maneuver elsewhere.
You're right, in SR4 you could equip a drone with a winch, but even then slots were sparse. I prefered to equip the Dalmatian with a blinding light and a laser weapon to mimic the Terminator Hunter-Killer drones
In SR4 my rigger used a modular cyberarm with a grapple hand for this stunt.
A cheap everyday solution to achieve similar results of escape could be to have microwire spooled up into a custom-made belt buckle and the belt buckle shaped to be used as a carabiner. The drone would need to get very close to the rigger for that, but might be a good way if you're chased on top of a roof without other options or something ...