pelican mustang 100x
I've seen one with the Pelican Ergoboost in it. So it must work somehow. But this must get you pretty high in the boat.
I think I'd get a sit on top if I wanted to carry more gear or an anchor, but that is me.
I've also seen the following used:
https://www.amazon.com/Leader-Accessories-Black-Deluxe-Kayak/dp/B00ITLA5M0?redirectFromSmile=1&th=1
https://www.academy.com/p/magellan-outdoors-cayman-kayak-seat