So, I had a chance to go back to my original board design and figured out a way that I could make changes to the circuit in Eagle that would not cause the existing trace layout to change. That let me start dropping components that are no longer needed and add in jumper wires to change sections.
That will allow me to still use the three ADM3052s I bought, since I'm almost certainly not going to need them for anything else.
So, I'll be reconstructing my first board to validate that variant of the minimalist circuit and, if I get it working as expected, I can assemble the other two and sell them to some folks that want them. Since I don't need the little power supply module I originally spec'd, the total component cost is actually pretty low - maybe $30-40 between the boards and the chips. It's all just been labor, testing iterations and assembly. For my sanity, I feel like I'd need to sell them for at least $100+shipping.
So, if anyone is interested in trying to use one of these, let me know. You will need an Arduino Due, a CHAdeMO port with wiring, a set of contactors (GX12BA) and you will need to splice into your DC bus.
The version I got from Sefs bolts the wiring inside the TCM but there is no reason it can't be spliced into the harness elsewhere. You could even potentially make an in-line tap using the same connectors used on the TCM and harness - similar to this https://www.te.com/usa-en/product-YH800 ... 50M-A.html
- and then it could be installed with effectively zero modification of the HV hardware. If you have a later model with CCS, you can also tap into the battery bus inside your EVCC case.
Though don't go buying anything until I have them really REALLY validated as working.