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No, you don't need a 'very bespoke AOSP' to turn your phone into a Rabbit R1 — here's proof
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
The article says that you need a custom launcher to establish a connection to their cloud service, so the apk only won't do it either way. But give it a few days and someone will have rigged up a full package, no doubt. Then you've probably got 6-8 weeks to use the service before they kick the bucket and shut down forever...
The APK is called "R1 Launcher"...
They've already proved it works from an Android phone.