OK? I thought vulcanic ash was rougher than sand anyway. With the process discribed above, freezing lava on a bed of ice, there can't be that much glass in the sky? How much ice is left to be blown up on a vulcano that has been erupting for almost a week?
Re Dutch and German experts. All you have to do is fly through those dangerous skies and let the engineers on the ground examine the results. A bit more respect for the people who are actually working on a solution might suit us!