Playing a Timeline backwards with Rig Builder

Unity Engine
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I am trying to create a set of cinematics that can be played forward and backwards so I am using a Timeline that controls all the characters in the scene. And to make the animations look more natural I have a Rig Builder on each of the characters with Multi-Aim Constraints. Everything works fine playing normally but I am unable to figure out how to get it to work backwards.

I can just set the play speed with the Playable Director (director.playableGraph.GetRootPlayable(0).SetSpeed(playSpeed)) and everything looks right but that is “unsupported” and floods the log with assert failures.

Otherwise, I think it is possible to create a Playable Graph to handle this but I have been unable to get it working correctly. Either only the Timeline animation or the Rig Builder seems to work, overriding the other.

Does anyone have a suggestion for how I might get these to cooperate?

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Well… I spent way too long trying to mash the Timeline and Rig Builder Playable Graphs together in every way I could think with no luck. I am guessing that Rig Builder does something special that I can’t replicate easily in manual update mode. So I tried leaving them both in GameTime mode, setting the Playable Director graph’s speed to 0 and manually setting its time each frame. It seems to work and nothing complains but it feels like a hack and I’m not happy with it. Oh well.