I've been looking in to perfecting all of this for my next build. And since the space inside a steerer is so limited, I've been thinking about losing the sleeve or any other form of star nut/expander plug.
And I'm currently looking into 2 options, go for a One Up EDC lockring for my pre-load. This means I don't need a top cap, thus not needing a star nut of expander plug. https://www.oneupcomponents.com/collections/edc
The second option would be a problem solver adjustable headset spacer between the stem and headset. Not sure about the looks though.