I've heard forum members say that Vargalant makes a compatible ball joint. After some searching, I think I found it:Hi
Here in Germany, if an axle handlebar is damaged, the M12 ball joint is replaced, the entire axle is replaced by an M14 ball joint axle handlebar and the bearing housing for wheel bearings. Only the damaged part is paid for.
The manufacturer Vargalant has ball joint in M12 for the R8.
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Looks like it's the only thing they make for the R8. But there is not stated price on the site and I can't seem to even add it to the cart.