I'm in the same boat. Give me USB-C, page turn buttons, maybe even wireless charging and I'd upgrade almost reflexively. I've been eyeing various Android-based eReaders (like Boox Page) that have Kindle support through an app.
I have a single USB-C to USB-C cable for travel that has a permanently attached USB-A adapter on one side, and lightning and micro adapters (also attached) on the other end. Not as slick as just USB-C, but it’s a single cable that does power and data, along with a single USB-C brick, and since it does data it works in any rental car as well. Check them out!