<< But I'm not seeking a keyboard that is necessarily AI-powered, only one that is hands-free/chord progression-powered and has a wide variety of styles and grooves to choose from. >>

It would be interesting to hear how you would be implementing your concept live. There was a good discussion back in November 2023 very similar to this one with some thoughtful suggestions about triggering BIAB audio snippets in live performances.

Some of the discussion was centered around the Ketron Event Arranger Keyboard with Musocity demonstrating a program he designed for BIAB to be triggered direct from ram. (This concept has since been implemented in BIAB)
Musocity: "... video example, these are the actual wma sections that Biab plays after it has decompressed them into RAM.
Reaper is playing all the wma sections of all different files direct from disk (RealTracks and Drum folders on Biab USB 3.0 drive), markers have been added to every beat so transitions will occur on the next beat rather than next measure, so as I input a chord it will go to that chord on the next beat seamlessly:"

It's possible to convert Musocity's concept onto Yamaha PSR Keyboards that doesn't require a computer when performing live.

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