Klaus has said he is working on adding Audya but don't hold your breath. SD is the best you can get now on EMC Universal. I have an Audya, Roland G70, and KN7000. I have converted all around with varying degrees of success. However, it is true that it will never sound as good as the original keyboard, but with tweaking, you get get fairly close without live drums and guitars of coarse.
pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact