Just an opinion, adding Alk supplement to raise pH may not be ideal plan. Alk will go up as well and that may not be desirable. With kalk both Alk and Calcium will increase.
Also TM NP BB contains trace elements and kalk may not play nice with trace elements.
I am not sure how you supplement your alk, but if you are using baked baking soda or kalk you are boosting your pH.