There are point probing tools on AliExpress that could likely be used to extract the data without having to solder, but you’ll be spending like 50$ pre tariff.

Having important files on a USB stick is by definition risky.

How risky is to de-solder an usb plug if the flash-drive contains important files? It would be relatively safe for someone capable, or the heat is way too risky for the chip/content?

If you’re halfway competent, it’s almost risk-free.

Also there’s any (MacGyver like) way to quickly access the file or reconnect the plug without a solder while only having access to office supplies?

That’s unlikely.

I don’t know what your story is, but if a key part of the plot is removing a USB fob’s connector to hide files, and quickly establish contact with the old plug to read them, you need to rethink that part of the story because the whole thing sounds very contrived to me.

I agree, someone competent can do it risk free. One possibility, depending on how macguyer or prepared the character needs to be is to use pogo pins. Perhaps magnetically held in place.

there’s dosdude1 soldering away on NAND chips; this should be a walk in the park even for a hobbyist.

as to macgyvering, the S in USB is for “serial” and such a connection needs very few wires, three if I’m not mistaken. so an absent USB connector could be fixed temporarily with clips and wires and such.