Figma Swap to sticky header on scroll within the same frame workaround

Figma Swap to sticky header on a scroll within the same frame workaround. 

The standard workaround with different copies of the same page won't work on larger projects, so I was looking for a way to be able to swap to a sticky header after a specific amount of scroll, but within the same frame design. Here's the result with some added notes to make it easier to understand.

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