I've researched this some more and according to Randy Holmes-Farley who developed the two-part formula I'm planning to use, the improved recipe does not substantially skew the aquarium's ionic balance any more that just using Kalk alone and this can be mitigated with regular water changes (which should be done anyway) as stated by Ping. Obviously every aquarium's demand for cal and alk are going to be different and the solutuion neeeds to be tailored to fit the demand and an eye kept on the water chemistry.

I'm going to dose my two-part manually to begin with but have found a low-cost method for automating the process on another forum and plan to give that a try asap.