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Can anyone recommend an implementation of `TopAppBar` that simply takes a single Composable (no slots for nav, title, subtitle, actions, etc) and has support for nested scrolling?

Probably easiest to copy the implementation one you are looking at with all these slots, and simply remove the other slots and adjust to your needs. Shouldn't be complicated.

Try this one -
<https://gist.github.com/beAnkitK/b7f92960c3a12182b8dd83fc13eb01bc|https://gist.github.com/beAnkitK/b7f92960c3a12182b8dd83fc13eb01bc>

It includes material3 scroll behaviour along with ability to place your composable anywhere.