Here are a few more reasons to start by hand rather than dremel.

Straight razors are very fragile, especially as you closer to the cutting edge. They are very thin at the cutting edge. Using a dremel, or anything with a motor, can ruin the blade quickly, better to get the basics down first.

It's bee said, though I'll reiterate. a dull straight razor is still very sharp. The Dremel can throw it with plenty of velocity to hurt you or someone else.

I've cracked and ruined a nice Solingen razor with a dremel.

Also, I don't believe in taking a vintage blade and making it look brand new. Doing that erases all of the history. I want to remove and arrest and rust / pitting and clean it up, but that is all.

I believe the best way to remove rust with with a piece of pure copper. Copper is harder than rust and softer than steel.

I found that I enjoy making scales more than restoring vintage razors.