Woah, that's a pretty cool idea.
I legit would've used that if it knew it existed.
I just read through your whole blog post, good job.
I don't have any individual fusing at all on my 36v eBike battery bank, but I have them all paralleled and run through a Class-T fuse
and a circuit breaker before going to my inverter.
Btw I also am dealing with the same situation you are in, where I am really left in the dark as to whether any individual pack has failed or not, it's hard to tell without occasionally individually checking each.
I have all of the batteries running through a shunt, so I occasionally unplug every pack but one and read the voltage that way, doing it for each of my 10 packs.