Have them show their IDE's scripting environment and how they can quickly prototype an automation for something annoying without even going the distance to write a full plugin and then bind that automation to a key.
Then open org or something and show how you can write a version of Lispy for org outlines based on some predicates like org-at-heading-p
.
Long-term, lisp dynamic module -> NDK and you need some manifest permissions in the APK
Years ago I had some experience using a dynamic language with the JNI to introspect the Java interfaces and call them. Fun times.
I can probably scaffold up some work, but only if people show me that they want it.