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!

just to be clear its a small piece like this https://www.amazon.com/Adapter-Adaptor-Charger-Extender-Sams... which I feel like is much easier to bring around than another cable, but I can see how it's annoying to have another dongle