That is a great project for your bone scales. They don't look like you need to take a lot off of them for the thickness. I think if you figure out which of you scale pairs is the smallest and match all the rest to those it would be the simplest way, although you also need to consider how they will size up with the originals. It is best if the scales match nice with the tang size when they are open and in the stropping position. I made a set once that was quite a bit wider and it made for an unnatural grip when stropping. Lead has to be the easiest material to make wedges with as it is so easy to shape. I look forward to your progress reports if you have time to make any.