Thank you. After I posted This post I reached out to him to see if he could make one. I was amazed that in a few days he had already built a prototype and sent me some pictures. He wasn’t happy with the engraving so he worked that part out.
Then we discussed the hardnesses I wanted listed so I gave him the ones I use the most.
The end result is amazing. It’s a friction fit, the cap stays where you put it. A minor irritant of mine is when the hardness indicator setting doesn’t stay put. I have not had that problem with these.
They are not cheap. I paid 25£ each. Maybe once people start buying more the price will drop?
The Orenz converter was 5£.
Here is a link to YouTube showing it in use.