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You can buy a pixel device and flash it to AOSP here: https://flash.android.com/

Install a launcher of your choice and be on your way: https://www.tomsguide.com/uk/round-up/best-android-launchers

Is there any notable difference between flashing a GSI vs flashing AOSP from source or is the latter just done to ensure a degree of control over what one puts on one's device?

No difference except you did it from source and spent the build time yourself.

brilliant!

There is GrapheneOS too:

https://nitter.mailstation.de/DanielMicay

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