I will be floored if you find me a "Pakistan" straight razor that will shave....
These are notoriously poor shavers due to the quality of steel that is used to make them.
It's unfortunate but true. New, old, what have you. The 'Pakistan Challenge' has never been accomplished (getting a bbs-shave edge) in the years I have been in this. Many have tried......
Some have claimed to have gotten the edge, to only have it dull in the first pass.
Anyway. As for removing the scales, that has been covered here many times over as well. Do a search here on 'Pin removal', or something along those lines.
Don't sweat messing up these scales. If they do break, I am sure there are people that will be more than willing to donate their Pakistan razors for you to work on. (Almost everyone has fallen for the poor picture, one razor in the group, in experience, Pakistan razor acquisition....)
Good luck and keep at it! Cleaning up the blade to the level you did is one of the hardest (time consuming) parts.
C utz