Ah! Beware of the butcher with a Dremel in search of a project to use it on! Know your Dremel wielder!
You can sand your knife by hand and you will avoid the super-rapid agony of slip ups with a Dremel. Trust me on this. Don't ask how I know (DOAP!). There are gunsmiths, there are gunbutchers. Same in knives.
Autoparts stores (Pep Boys, etc) have multiple grit sandpapers for autobody refinishing. Suggest 400 up through 600 or maybe 1000 grit for your knife (1500 and 2000 grit are just super fine, too fine for a satin or brushed finish, they'll get towards mirror). You can also use ScotchBrite, same effect.
Take your time. Use very straight, consistently straight, deliberate strokes, obviously starting from the 400 grit or Scotchbrite and getting a uniform series of tiny, straight scratches. Get all the offending cross-grained scratches from the keys out with the 400. Then move to 600. You might stop here. Maybe to 1000 if you like.
It might help to get some tongue depressors (super cheap for a boxful, many uses, medical supply store in a business park or something) or other straight sticks to wrap inside the sandpaper. Helps to anchor the knife somehow. Between leather in a smal vise maybe, with surface to sand above vise jaws.
I've done this myself. On a handgun slide, and on two knives. It is a method used by many custom makers. Others use Scotchbrite wheels on buffers (much quicker!).
You may need to disassemble the knife to do it really right (dodging around screws, pivot pins, etc).
