I was thinking that someone with a 3d printer, or good woodworking skills, or a variety of other techniques could manufacter a back cover for that paperwhite and basic kindles, that make it easy to serial jailbreak.
The idea is that the back cover of a paperwhite has the screws in a known location, and the serial debugging pins would be at a known offset of that.
Then someone wouldn't have to solder to thier motherboard, but they could buy a replacement back cover, that had holes directly over the serial pad that let them plug something like this into it:
https://en.wikipedia.org/wiki/Pogo_pin
They would still need to take the front cover off, unscrew all the screws, and put on this replacement back cover.
Alternatively, a frame of some sort you could slip your kindle in, and then use an exacto knife to cut out a square of the back, and then a replacemnt square could be clicked in place that had those pins on it.
Just a wild thought that ran through my mind the other day