I was always a Technics man until my enforced change.
I have never owned, or even seen a Korg in real life.
Korg owners seem completely happy with their boards so I wonder why Korg have never thought of making a Style player midi module for those who already have a board they like but could bring a new freshness to it.
Viability, they need to get back what they spend on R&D, production and marketing etc. and the demand is just not there for them to make a profit. (Even Roland have discontinued there BK7m Midi module)
As far as I am aware, Ketron do still make hardware modules but I think they are the only one. (Also if you have a tablet or computer there are a number of software modules available which can be used)
Bill