[Help] combining animation of transform.rotation with hinge joint motor issue

so I want to make a Frisbee effect. I think is also called hyzer or anhyzer. Its the wobble as it spins.

I'm using animation to make the disc tilt transform.rotation.x and transform.rotation.y between 20 degrees over several seconds. The problem is, that to spin the disc I'm using hinge joint motor component. Since that is also part of the transform rotation, the animation is locking it to 0.

I guess I can just make a dummy object now that I think about it. But maybe this is an issue unity can address in the future, or someone else will run into.