Whoa - cool down Kenny boy. If you have forgotten, this place is called DIY - meaning if necessary you try to be creative and may experiment, and if there is no obvious solution, then you may try things outside of the book. If you want to cling to your nanny safe space, that is your option, but no need to be rude. It has not been written in the Bible that it is a grave sin to work on the HV line. Anyone with some knowledge of electrical engineering would know how to do that.
That is exactly what I am doing on my Leaf and there are write-ups on the net about that.
"Have you tried any of these and have experience?" -- do I have to? I have made it clear that these are ideas, and not true and tested courses of action.
"Is any of this based upon any test data?" -- by definition there are no experimental data on ideas and methods not generally tried. You don't go by the data, you go by the model.
"What good is a 50V charger when he has a 400V pack?" -- did you even bother to read and understand what I wrote? I said string six 60V DC CV power supplies with one CCCV charger. Read again.
There is a contactor, switch or connector between the pack and the hybrid power circuit. You open that contactor, switch or connector and insert a resistor. When you want to drive, you remove the resistor and close what has been opened, or short the resistor. Any engineer can tell you how to do that. And no, it is not taboo or evil to work on the HV line.