ASIO PLUG INS + FX SPDIF IN MASTERING CHAIN: POSSIBLE?

HI,
I am already using the Casio plug in to patch the external analog mastering chain. I would also like to use a digital Eq through the SPDIF connection to my sound cord. I know how to do this in Cubase but what about Wavelab? It looks you can only use 1 single instance of Casio plug in at the same time and I do not see how to set up an external fx connection.

Any solution?

Fabio