On my side, I have just finished the restoration of my 8350B and did a complete alignment. It meets all specifications.
I also finished with the 83595A plugin, changed some parts and realigned it...it wasn't as easy as I would have liked, but everything works fine now.
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So, maybe I can help you, I'm going to measure the currents of the different power supplies, as well as the associated voltages and ripple, it will give you an idea for the next steps.
I have 3 different plugins; I will look at the different loads.
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I hope you find the plugin you want at a reasonable price.
Thank you for your words Yves, for now I have put the 8350B project on hold. I am looking for a plugin at a good price to continue checking current consumption. Again, best price tags are on the States, but high freight costs and customs to Spain makes the deals more difficult. So I must be patient and still searching every day.