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Yes the bearing cover doesn't preload it itself, it just holds the preload. The same as a stem would on a normal set up. So you are fine to just remove it and swap it for a round one.
I was just going by what I'd seen online including the acros website and the official canyon conversion kit and which includes a new expander and cap but you should be fine using your existing bung assuming you either have it at a suitable depth already or you're able to get it out and refit assuming you want to cut down the steerer.
I don’t think it will if I understand it right, the only thing that should change is the headset bearing cap seeing as I’m using the same bar/stem. The aero shaped one should be compressing the stem and headset cap just like any other shaped one would. I could be getting it all wrong.
Only other problem is the expander is stuck…