Can Video Assist 12G accept RAW Input from FS5 ?

I know that it can record BRAW from supported cameras, fs5 not being one of them, but can it accept raw input via SDI form an fS5 but debayer and record it into regular ProRes?

Thinking of getting an FS5 on the cheap since it's old and upgrading it with external recording but don't want to switch to Ninja V or something, since I prefer recording onto SD cards and the power options of the Video assist 12G.

No the Sony FS5 Raw recording is not supported on that VA 12G, not likely either given the camera is EOL. The only two cameras supported for BRaw recording are the Panasonic EVA1 and Canon C300 MK II.
Cheers