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The collet diameter is pretty small, might not grab well in a large drill chuck, but should work in smaller chucks. I doubt your drill will give you the rotational speed of a Dremel tool, but you should be able to use them as you say, "in a pinch."
It probably depends on how thick the Aluminum is, but I would think one wheel would do the job no problem. Cutting thin material will likely generate a sharp edge that could cut you no matter what. I wouldn't expect a rough edge with this. Depends on your ability. I have the 8220. Nice not to have the cord to worry about. Not familiar with the 7300.
I don't think those wheels are made for that
They are dividers to segregate the box/case into three compartments. Notice one is shorter than the other two, that one goes in the middle.
I used thin cut wheel on 3/8" finishing plywood. Practice first & you'll get clean cuts. Be patient.
According to the Dremel website it is for metal.
I used Hack Zall for exhaust, tried cutting pipe broke first wheel, Drexel , I do believe, is a smaller diameter tip.
You can score cement, don't know how thick you want to go.