microSD Card FS Emulator via Jetson TK1 and 3.10.40-grinch-21.3.4 Kernel

I am using the 3.10.40-grinch-21.3.4 on TK1, do you think it would be possible to, after electrically connecting the appropriate J3A header pins (CSI CLK Input with 4-lane pins seems most plausible at the moment) to a digital camera’s SD card terminals, using the TK1, emulate an SD card connected to a camera acting as host, thereby feeding a video stream to the TK1 while the camera records? It’s a convoluted way of doing it, I know, but due to camera limitations, pulling from the SD card write stream is the only option. The real trouble I’m facing is coming up with a 50MHz, externally clocked (made available by the camera), 4-bit parallel sampler using the available GPIOs (can only push ~335 KHz on GPIOs at the moment), and appropriate CSI interface documentation has been difficult to track down.

Thank you for any insights in advance!