I don't intend fitting the C/R, unless I have to.
Nope, C/R not really needed. Just leave shield connection intact through the cable and keep it separate from logic ground, and obviously use the logic ground for the LA/scope connection.
It doesn't hurt to have the 1M resistor between shield and ground as you have it, but that may also already exist in one of your other devices on the bus.
If you have extra PCBs/connectors than I'd be happy to contribute some $ towards one or two and the cost of postage to Sydney.
I have a bunch of GPIB/HPIB gear in the office lab and at my home, spread across several benches, and with some still needing repairs.