Fwiw, the ones I have remember their last pairing setup, so I only need to power them back on via the "Start" button.
Still think it's worth it, also to not destroy an original one. On the other hand, better to modify it like this than to throw it away of course...
But it has a huge problem of false diagonals, making is absolutely worthless to play tetris, or any fighting game that requires precise control. If you need precise controls, avoid this model.
On the other hand I've had back luck with generic NES and SNES knockoff USB controllers. The quality is much worse than the originals especially in the D-Pad. It seems nobody but 8BitDo can get this right.
If you stick with 8BitDo you'll have great quality but they don't necessarily match the form factor of the originals. I can see why OP would want to convert a real one.
However, if you yourself want a USB SNES controller, consider buying one instead. 8BitDo offers them with the SN 30 Pro - the quality is good, they work with the Nintendo Switch or PC (including Linux), they have the additional buttons needed for modern games, there is a wired and a wireless version and the newer variant has afaik a replaceable battery (unlike the first).
Edit: I was probably wrong about the replaceable battery, that was the 8BitDo Pro 2. Which might indeed be the better choice. Looks less like a SNES controller, but at least still has the correct button labels and core layout, see https://www.8bitdo.com/pro2/