The business problem with this is that the vendor will no longer be able to provide any guarantee on the product since it will strongly depend on the user handling. It will also lose most if not all traceability to be able to say that the user did something wrong or didn't do something that was ought to be done to maintain reliability.

If some enterprising hardware folks wanted to create a PCIe or SATA attached flash with minimal interference for external control it would be very interesting to me too. I wanted to buy OpenSSD device for experimenting but at a price tag of $3000 it is well beyond reach for me for pure experimentation.

I wonder if crowd-funding can help bring such a thing to life.

I appreciate the spirit of the request, but to be blunt any large company would probably never spend resources on this. Basically large SSD manufacturers are focused on billion dollar markets, and the demographic who would appreciate a "bypass mode" is probably so small that the company would never recoup money spent on implementing the feature.