Preserve stroke widths when splitting a tapered path

[Lindsay Wilson]

Suppose I have a path in designer and have used the pressure curve to apply a tapered stroke profile to it, like shown in the attached image. For example, I set the width to 50pt and then taper from 100% to 25%. If I cut the path in the middle, each half has the same overall style as the original, i.e. both have 50pt weight and taper from 100% to 50%. This is not what I’d like. Instead, the split paths should maintain the original visual appearance as the original path. The first path should taper from 100% to 62.5% and the second path from 62.5% to 25%. This would be an extremely desirable feature to have. It should look at where the original curve was split, then split the pressure curve similarly at the same ratio along its length.

Now, I am aware that I could expand the stoke of the original path first, then split it, and this would maintain the visual appearance. However I do not want to do this, for a few reasons. I want to be able to edit the path subsequently, and I need to be able to expand the path after the split (this relates to creating interlacing knot works from self-intersecting curves, by expanding stroke and then using the shape builder).