I think the purpose of drones wouldn't be to target MANPADs, but artillery, grad launchers, transport, supply trucks. If anything you'd rather let the drone soak up manpad fire because it's better to lose a drone than a helicopter.so far there is no video of ukraine using medium range SAMs operationally in multi shot engagement.
i dont think slow moving UCAV can identity manpads. unless UCAV has JSTAR type equipment with size and power of airliner.
fundamentally it is still Ka-52/Su-25 with rockets/ machine guns at low altitude fast passes.
You can do the same with Ka-52, or even Su-25 but compare the running costs, flight endurance times, and scalability. Two squadrons of WL-2 would mean you could be continuously harassing Ukrainian lines 24/7.