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At Omnium the front is also a threaded steerer like Mads' bike, but Jumbo designed one with a pinch bolt to lock into place. The old ones which only had one nut and the top cap rattled loose quite often. I think the version @Mickie_Cricket is trying wont be sufficient, like you seem to have realized already.
https://omniumcargo.dk/shop/product/locking-headset-cap-cargo-only/
I managed to use one to make a pretty neat threadless to ahead conversion, so it can be bodged to fit other headsets than an integrated one.
What the story with the headset here? Asking because of this?
https://www.lfgss.com/comments/15073617/