With the barrels off and the ejectors in place and down, push on the ejector stem ends with one finger, gently until they move outward. If you can feel no resistance to them first moving, there is none from the bluing. If you do, only the areas where the sides of the ejectors are making contact would need polishing to alleviate it, most likely.
Nothing wasted on what you are doing. It is one the main things many doubles made at the lower price levels are lacking. Handwork. It's not the only thing many lack, but it is a biggie. It's admirable to do this kind of work, and it also helps prepare you for moving up into working on the better grades of guns.
SRH