I have been keeping an eye open for one also for some time and have come to the conclusion that if one doesn't pop-up eventually I will use an MG cam cover logoed fixing bolt with a steel shaft threaded to suit. The lower part to be ground flat and marked accordingly.
Thanks Bruce, Yes, I have kinda resorted to having to make one. Ordered up some aluminium to make up a new handle today. I am looking to use a cam cover logo which I will incorporate into the new handle. Regards, Bruce