I didn't create a demo because I am not sure on how to approach the problem. I'll try to explain it better.
Let's say I have an SVG with three paths (a,b,c).
I'm morphing path a to path b back and forth using TimelineMax and morphSVG. This morph takes 20 seconds to complete.
Let's say 5 seconds of the animation have passed and the user starts to scroll. Using ScrollMagic I'm trying to morph to path c from whatever the state of the svg is at 5 seconds into the animation.
Hopefully this clarifies my problem.