So. After researching many resources including videos and having a chat with an actual luthier about how to round off sharp fret ends, I got out the Dremmel and modified a commonly available cheap flat file into a fret end dressing file by smoothing one narrow side and a bit of its its edges. After the Dremmel, I sanded it with 220 to 400 grit. Not as fine and fancy as the one available on Stewmac, but gets the job done perfectly.
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Perfectly ... meaning as well as my zero experience allows I am not 100% satisfied with the consistency across frets, but after 400-600-1000 grit careful sanding, this is the result.
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Feels nice too, much better than was before, out of the kit box.