Removing drm from .azw3 is easy. [0] All you need is the ID of your kindle, since it's tied to your device.

There is also a plugin for Calibre, although I haven't tested this myself. I'm not sure if it requires a device ID or not. [1]

[0]: https://alexwlchan.net/2019/08/removing-the-drm-from-my-kind...

[1]: https://github.com/apprenticeharper/DeDRM_tools/wiki/Exactly...