I have a Nikon Cool Scan 9000 and I've kept my old 2010 Mac Pro for scanning, and for occasionally running legacy 32-bit programs, PS CS6, etc.
For those people caught in a hardware bind with not being able to connect to their scanner, buying an older, second-hand computer with that capability might be an option.
Also, there are variations in the ability of different brands of adapters to perform the same conversion, some work better than others. I have an Apple HDMI to DVI-D adapter that doesn't allow Spectraview to sense my monitor, which I think is because the adapter doesn't allow 2-way communication.