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@PhilDAS
The 10mm spacer under the stem has a bolt and thread?
If so, that is holding the preload to the headset bearings so the stem is just clamping to the steerer and not actually compressing the bearings like on a normal headset.
I think all you need is a regular expanding bung, top cap and bearing cover to convert the headset to a regular type which will be compressed via the expander and cap and held by the stem.
The problem is that you won't find the aero shaped bearing cap other than the canyon one but you should be able to find a round one. It just won't match up with your stem as neatly. Like the certified slammed one.
Something like this maybe
https://acros-components.com/en/steuersaetze/is44-steuersatzdeckel-ai-70-4,5mm?c=219