It would be convenient to be able to bootstrap the sonar-scanner cli from a single portable script that automatically downloads the correct scanner+jre for the current platform.
You already have all the code for this in pysonar-scanner. It just needs to be packaged as a single script with a #!/usr/bin/env python3 hashbang rather than a pip-installable package consisting of multiple files and repurposed as a portable bootstrap loader that is not specific in any way to python. The python interpreter would just be used as a (nearly) universal runtime environment to bootstrap the next phase.
This script should be small and stable enough to just include it in the project repo which should greatly simplify deployment to developer and ci environments.