I've had the same problem for a couple years - specifically the GPU crashing. Had a very hard time isolating the issue - seems like a mix of static + the EMI spike OP talks about (it happens most reliably when I stand up quickly from my desk chair).

My guess is that, like OP, we're both getting interference in the our DP connections, and that that interference is in our cases causing the GPUs to crash.

Haven't had a chance to try ferrite cores yet but that was going to be my first test.

Curious what system specs you have in case we have overlap in anything that could isolate the issue. Mine: https://pcpartpicker.com/list/Xpdb8Z