Acetone will cut nail polish. However,if you can obtain nail polish,you can obtain "oily nail polish remover?
cetone is so volatile,it will only stay on a surface a few seconds.The "oily" part of nail polish remover gives t some working time,and prevents the stff from re-sticking as the acetone dries out.
As far as damaging your bluing Some things,like solder flux,and abrasives,will damage bluing. Bluing is a refined,burnished rust That's it. It serves to create a semi=porous "tooth" to the surface of the steel. It acts almost like a primer to give rust preventative oil,grease,or wax something to bond to
Over time,this may develop as a patina,or like the seasoning on a cast iron pan.
While the acetone would be unlikely to "hurt the bluing",it WILL strip away the "seasoning" or patina. You might notice a visual difference The spot will heal up,mostly,with the application of some oil,,but who knows what beedwax,carnuba,lanolin ,etc had been htere.
Take the stock off. Murphy's law. Acetone will attack wood finish.
If you have some on the shelf.the Methylene Chloride gel paint strippers ought to cut nail polsh.Its a gel. Apply just a dot with a match stick.
If you need penetration...mix just a littl batch of acetone with ATF or Marvel Mystery oil or PB Baster.Give it a minute. Clean out the screw slot,and use a precise,fitted screw driver. Not the one that came with the sewing machine