Hi Nick,
something additional that might be worth considering is the EC5 pedal. 5 foot switches that can be programmed to trigger fills, variations, all sorts of stuff. Frees up the hands.

Don't know if you're into style programming? but guitar mode is brilliant for creating guitar tracks.
A single note can create strums , up, down, etc , even inserts fret noises automatically.

Korg also supports multiple time signatures ie you can have a 3/4 variation, a 4/4 variation & multiple tempo's in the same style. Great for medley type style.

Copy function is great. You can even copy a multipad into a style track & vice versa, create a multipad from style tracks.

There are 14 settings for fills as to what you want them to do ie fill 1 goes to v1 or v2 or a self fill etc etc . You can basically set them up for a style.

There's a drum remap function, that alters the drum track in a style ie you may have bass, snare, hihats etc playing, you choose one of the remap options & instead you'll have bass, rimshot & hihats playing.
Just alters the style slightly.

It's a pretty amazing keyboard.

best wishes
Rikki