Quartaroy,
Ok don’t shoot me for being a “master of the obvious”!!! lol
Why not just code up your own function to do what you want, instead of putting in more time, trying to find something, that may, or MAY NOT, exist? You already know what you want it to do, that’s 90% of the work done, the rest is just code.
Your desired function seems pretty simple, you know that you want it to take affect when event X happens, you know where points A and B are, and the closer you get to B, the more you accelerate the deceleration, so it’s an inverse proportion. Heck roll your own, and be done with it! lol
Ok, now you can shoot me, for being a “master of the obvious”! lol
Have a great day!