Hmm, that’s quite a pickle. Instead of a timeline, you could use a Delta rotator node to compare current and desired rotation, absolute and multiply the result against a float from a curve asset, then that feed into the interp speed to handle acceleration. Granted, you’d still have to add the curve as a var to any non-child bp that need the functionality, but probably less painful than rebuilding timelines.
If that doesn’t work (or is too expensive lol), maybe make new topic? I’m honestly not sure of the exact protocol here for partial solved topics…