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hollowpoint
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I’ve never been able to do precise work on metal with Dremels. I would personally have a hard time evenly opening up the port with a free hand tool, and I’d be worried about marring up the valve seat.

If I were to do it, I would use a set of index/numbered/lettered drill bits, and enlarge with a drill/drill press and stick the part in a vice or jig.

Here’s a download chart on drill bit sizes that might be handy if you go down this route.
http://www.smithbearing.com/images/pdf/ENG-FractionalChart.pdf

A #1 & 2 drill bit would slightly enlarge to 5.6-5.8mm ish, and lettered bits A, B, C, D would get you closer to 6mm. Whatever you do, please don’t buy these drill bits from Hazzard Fraught (Harbor Freight) though.