I suspect the problem is being able to do this in a way that doesn't involve large quantities of high speed shrapnel or 5Kg of drone landing in a built up area.
I'm a layman but a quicker answer may be to have a qualified drone pilot/s that can fly a large drone to knock the other one out the sky over a safe area. Have some of these guys on call.
A technological answer is likely a while away. Drone V Drone you could do tomorrow and a human could chose to leave the drone or hit it depending on the location.