I want to look and polish or form a nib in action. Your information leads me to a 5 to 8 X, correct?
You'll have to try it
I have a 10X magnifier and I can't get the work in focus far enough away from the magnifier to do work. Where I worked a lot of fine assembly work was done under magnification and it was usually limited to about 3 power or so. Before I looked at a loop I would look at lighted desk magnifiers and see if you can find one that will work for you. Of course you might have a hard time finding a desk magnifier not made in China. I don't think loops will have that problem especially if you want a good one - Germany, Japan and the USA are about the best with lens.