I think for that kind of stuff, you might be better served with perhaps a Korg M3 (or M50 if on a budget) or Yamaha MotifXS6, that kind of thing. They still have chord following, but their soundsets and synth engines are MUCH more contemporary that just about any arranger...

Plus they have full featured samplers with beat detection and slicing, so you COULD sample the grooves from the legacy gear and then time correct it.

Arrangers, on the whole, tend to be more 'bread and butter' than what you are doing, and this dark stuff seems to be more arpeggio driven that style driven. I think, if you put a LOT of work in yourself, maybe a Korg PA800 might get the job done, but I still think a WS would be a better fit...