The current version is not ready for EDGE RUNTIMES.
You wrote: "Download package ZIP file from GitHub. A Git clone will not work, since the repository does not contain the compiled Java code"
However in order to inject the WxPassword package into WM.IO INTEGRATION to be used it need to be exactly deployed into a GitHub repository "ready to use".
The same apply if I like to use the new webMethods Package Manager (WPM) in order to deploy the same to an container runtime.