No Paul, it is a one-off, when I first purchased the bike it was fitted with the auto type valve using a ball and spring but having seen a video were someone had set up a test rig and demonstated that the auto valve can restrict the flow of oil, not the pressure but the volume of flow, I opted to fit a manually operated valve like you have done.
Then, sometime ago there was a discussion on this forum were members highlighted the consequences of forgetting to switch the valve on so that prompted me to interlock the valve with the magneto.
In the attachments I have shown a breakdown of the valve and micro switch so that other members can make one themselves, it is mainly made out of rod and sheet brass, pinned and soldered together. Although I have a small lathe that helped it could be made with hand tools ie drill, hack saw and files.
Hope this helps.