Have you been to Parts connexion yet they seem to be one of the better suppliers of audio parts.
Here’s one with gold plating. (https://www.amazon.com/FidgetKute-Plated-WE396A-Instead-Adapter/dp/B07KYJWTJJ) I suppose, if there’s a ceramic bodied/gold-plated contact one available, that might be better. Were I attempting to use a different pin configuration, I’d rewire the socket, obviating the extra, metal to metal connections(tube/adapter/socket). In your situation, that would be six wires to relocate, as 6, 7 and 8 remain in place. If interested: (http://tdsl.duncanamps.com/show.php?des=5670) and (http://www.tubezone.net/pdf/6dj8.pdf)