Philbert,
I think you've got the right approach. A fine Bronze Brush or Bronze Wool is softer than a blued finish and is always better than Steel Wool which will remove bluing. Case Color is also a fragile surface, so again stay away from steel wool. I'd brush the rust spots very lightly with Bronze Wool soaked in Breakfree or a fine gun oil.

"I hate rude behavior in a man. I won't tolerate it" - Capt. Woodrow Call