Thank you TeDs and Diki for your reply.
Actually what I really want is to use the keybed on the BK-9 , and play the sounds and style on the Korg Ek-50.
I would be using the panel on the Korg to control variations, sound changes, performance changes.
So technically the BK-9 would be used only to substitute the keybed on the Korg.
I'll have to experiment with this a little, but yeah I would need that Kenton midi usb host.