Lepton appears to be the new official name for Valve’s version of Waydroid (Android in a Linux container).
We still don’t have a whole lot of details about how this is all going to work, outside of Lepton enabling Android APKs for developers on the upcoming Steam Frame VR kit, but it’s now that little bit more official with a proper name and even a logo.
There are certain utilities, but it’s generally not useable.
Also most games where k/m would give you an edge over touch controls run detection and ban accounts anyway.