How to deburr holes in Aluminium without creating a countersunk drilling?

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Good afternoon my friends
So I may have bungled a bit on my custom top-cover by sheer over enthusiasm.
I drilled all these and was confident the holes would be shard and clean on the upper side, but the all have that tiny little sharp burrmaking it looking and feeling a bit rough.
I want to have them clean and, well, somewhat shiny, but don’t want to make the countersunk by ≈ 1 mm…
The tool I use tends to not bite unless I press so hard that it instantly cuts off too much material.
What should I use? Something to go with a very simple table-drill, or just a hand-tool?

(I was thinking of something that would rather grind than cut, but it’s 2 - 5 mm diameter…)

As you can see, this particular plate already is, erm, failed, but nevermind I fine if I can improve it (better than starting over, right?)

Thank you!
 

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