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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.
Technically, every Android phone uses a "very bespoke AOSP", because the Android kernel is customized for the hardware of every single phone model, which can include things like hardware drivers and carrier services.
This is the reason that there is no universal Android ROM that works across every Android phone, unlike Windows or normal GNU/Linux distributions.