DraggableScrollableSheet at the bottom of the page not screen - flutter

I would like to create an effect similar to DraggableScrollableSheet but instead of it being attached to the bottom of the phone, it is at the end of a scrollable page.
So the user scrolls to the end of the page and finds this sheet, which they can drag up and then scroll through.

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I created a screen with nestedscrollview that consist of a sliverappbar to hide when scroll and body with pageview. but when i switching between pages with swipes the scroll is not behaving as expected. the sliver app bar not expanding when swiping forward and its working fine when swiping backward to previous pages in pageview. Is there any way to force scroll from top on every page view?

How can my BottomNavigationBar float above hero widgets during page transitions?

I want my NavigationBar to float above my Images during page transitions. These images are marked as hero widgets so they expand and get placed at the top of the "details" page, but during the page transition the bottom ones clip with the NavBar, since the NavBar is not persistent in my case and hero widgets are supposed to float above the previous' page widgets.
I know an easy fix would be to also include a NavBar on the next page and mark both as Hero widgets aswell, but I don't want/need the Bar on the details page.
Is there another way to fix that?
Initial state
User pressed bottom image (partly behind the NavBar), it clips through the navigation bar
The image further expands

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https://material.io/design/components/app-bars-bottom.html#behavior

Push Pop Press style Scrolling

I am working on a app that requires scrolling implemented in Our Choice iPad app from Push Pop Press.
Has anyone implemented the nested scrolling like that?
Updated:
There are two scroll views, one on top with paging and another at the bottom. The top one specifies the Chapters and bottom one corresponds to the pages in the chapter.
So when you swipe to next page of top scroller the bottom one moves accordingly to show it pages. And you can scroll bottom scrollview to view the pages on it. Also when you are at the last few pages of the bottom scroll view and try to scroll then it changes the page at the top scroll view and update the bottom scroll view as well.
Here is the demo video of the app
http://vimeo.com/22872218