The hand brake of an XJS convertible I found on eBay arrived. Man, it does pay off to buy things in the US these days! For $$45,- including transport to the Netherlands, which translates into roughly € 30,- for a used hand brake.
For reference, when you buy this thing at a Jaguar Parts supplier it'll cost you something like € 130,- (not sure if that would be a new or a used one though) The return-spring and some spacers were not included, so I had to order those separately.
Cleaning the parts and re-assembling was a quick satisfying after dinner job. Like Andy, I too like the clean looks without the plastic handle, perhaps a pressed on piece of stainless steel instead of the plastic?