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My microwave walls have three different vents in them - besides, when alcohol boils and vaporizes, it creates pressure inside the unit so the alcohol vapor is bound to find its way inside the unit itself. Maybe I don't get it but I think the risk is when the alcohol is boiling (while the unit is running) and not after the door is opened. Not to mention that pure alcohol is a fairly powerful solvent which, over time, can corrode things inside the unit which could increase the likelihood of a future "event."
The safe way to vaporize alcohol is to put it in a pyrex (or similar) measuring cup and put the cup in a pot of water and boil the water. Putting a steamer tray in the bottom of the pot and resting the cup on that is even safer. The water should be at least as high as the alcohol level in the cup.
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