Sorry, but I would NEVER fly or allow any of my friends or family to fly through airspace that even had the POSSIBILITY of that type of contamination.
Damage to the engines is bad enough, but if you are flying on one of the newer Airbus aircraft with FBL (Fly By Light, fiber optic control of flight surfaces and systems) systems, those pito tubes could clog up in a heartbeat and the aircraft computers would drive the craft into the earth.
Friends don’t let friends fly through volcano dust.
Pitot tubes may be at risk here (I do not know but I doubt it because they don't seem to clog up from other airborne issues EXCEPT water/ice) but if so for very different reasons than jet engines. And your description of the computer response bears little relation to the supposed fate of the Air France flight.
Unlike the Egyptian pilot who deliberately drove his aircraft into the sea. Been checking on the pilots of the craft your friends & family are flying on, before they go?
BTW, the usual description of Airbus control systems is "fly-by-wire," as opposed to mechanical control. Electrical, fiber-optic and wireless signaling (yes I know they don't do this) are all very different from mechanical control.