UEFI boot loader to access internal drive

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As a stopgap until we get SR7.0 wouldn't it be great to boot a UEFI laptop into a mode where the internal drive could be mounted as an external drive on another system running SR6.1? Macs have had this for years (target disc mode). I'm sure there are some major technical hurdles but this should be pretty minimal software. We don't need options and graphics, just mount the drive to the USB port.

I wonder how much of this code could be written by ChatGPT ? I don't have the skills to take that code and test/debug/improve it. But maybe someone in this forum does.
 
Macs have had this for years (target disc mode).
From what I've heard, this feature doesn't work any more in more modern Macs.

mount the drive to the USB port

USB is not the optimal way to use SpinRite 6.1. SpinRite doesn't have USB drivers, and the BIOS support is generally sub-optimal, and in some older BIOSes there are even fatal memory overwrite bugs with USB drives beyond a certain size. (So much so that SpinRite has specific restrictions to attempt to address these issues.)