The Norton V4 has been around for a few years now - I think since 2016 at least. Norton ran it at the IOMTT for a few years, at first with an Aprillia V4 engine in it, until they had their own V4 ready. I don't remember whether Norton got this V4 into full production before their demise and resurrection by the Indian company, but at least a few found their way into owner's hands. I believe the asking price when under the previous Norton management was $40k or 40k euros. Not Cheap, but they justified it by throwing titanium bits everywhere.
Here's the now infamous Stuart Garner talking about the V4RR, four years ago: