Wide converter for the Q? Any thoughts?

I am happy with the Q's 01 prime lens, its just a little narrow sometimes. For going wide there would be the 02 zoom option (a bit large), the toy wide (quality issues), the fish eye (its a fish eye...) or getting a step-up ring for the prime 01 from 40,5 to 43/52/56... and combining this with a wide converter (x0,6 would be just fine). Does anyone have any experience with this kind of set-up or could recommend a good wide converter for the prime?
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