I’m pretty sure you need something called a “usb transfer cable” which can do the job. It has a special electronic chip in the middle that tricks each PC on either side into thinking the other is a usb stick. (Or something!??)

I’ve never used one, and didn’t know there was such a thing which existed until minutes ago. But like you say - probably a waste to use once.

If one happens to be an Apple brand, they do have something called Target Disk Mode, but assuming not since you say PC.