Not sure who might make one, but stuff with Switchcraft 3502 connectors would do the job. Its what I've used on similar vintage gear with the cramped connections. They make a gold one with a -AU, or the standard one is -A for nickel plate.
You could roll your own with some Belden 8402 cable and the Switchcraft 3502's. Its on my list of stuff to do. Its a shamefully long list.