Could we please understand that there is no Administrative fix to this problem?
You cannot make this matter go away by redefining regulations.
What we have here is a straight forward engineering matter: Fly through volcanic ash and you are going to damage the engines.
The damage may simply reduce the life of the engines by a factor perhaps of Ten, bankrupting the airline some years from now, or result in catastrophic failure, killing passengers, until sanctimonious news media stop talking about "mercy flights" and start talking about "cowboy airlines" risking their passengers lives.
I have a turbine blade in front of me....