Creating Zig zag line with larger size on one end than the other

I am trying to create a stroked line with a zig zag that tapers on one end, meaning larger size zig zags on the right side that gradually get smaller on the left. I know I could edit individual points to make them smaller, but this is tedious and would not be easily editable if I need to make changes. I have also played with transforming the outlined stroke, but it heavily distorts the zig zags and removes its editability. 

Does anyone know of any tricks to make the zig zags gradually change in "amplitude" from left to right while preserving the editability of the line (so I can just move the two end points, rather than rotate the whole thing or change individual points)?

The rough idea of what I want, shown in the picture below, was made with the curvature tool, but I'd prefer to use a tighter, more consistent, effect--like the one shown above it created with the zig zag effect. Thanks in advance!