I have already emailed Tighe.
Could you take it to a cam shop (eg Tighe) and get them to degree it and make a copy?
They can build up a copy using one of my stockies as a blank. But by the time you include postage etc., even they recommend my getting a replacement from the US for less than $100 more.
I liked their forthright advice and wish I was actually going to use them, but I won't be this time around.
I'm not quite so angry at myself today, but I'm still pissed for such a mistake. The problem was a stuck lifter, it was in, but not totally square to the bore. When I torqued down it just jammed more and the cam lobe placed pressure on the shaft.
Lesson - Always lube the lifters and make sure they are IN squarely so they can compress.