Way to go, modern phone screens are not too bad…I think a big reason I enjoy dumb ereaders is the lack of multitasking lol

Your kindle probably has a busted micro usb port (the cables too can stop working for data transfer), no idea if it’s too difficult to solder a new one… I would try cleaning it up really well first

It’s a powerful program but not a complete OS replacement

No but you can jailbreak them, and their OS is linux-based; unfortunately if it’s a new Kindle or newish with an up to date firmware, you might have to wait for someone to release a new jb method. With a jb you can install Koreader (which alone can do everything useful), but also people (mobileread forums) have compiled a working Python library and a terminal with bash…mostly useful to show off :) you can run neofetch

If you’re like me and need Koreader (has impeccable pdf reflow and stardict support), a Kobo is way easier, and you don’t have to wait