Best way to combine new tab bar with floating action button?

I have a floating action button in my app above a toolbar. The action button adds items to my app, so is pretty important and should be easy to reach. Now with the new liquid glass design, I wonder what the best way is to combine those two.

Should I use .tabViewBottomAccessory() for that? Though, that will merge down on scroll. 🤔

Or can I replace the search button in the bottom right with my own custom button action?

The bottom accessory seems to be fixed height - have you found a way to customise that? I'm in a similar situation like yours and would like to have a large action button, but if I increase the button size it just gets clipped off and the accessory view stays the same height.

Best way to combine new tab bar with floating action button?
 
 
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