possible to add a Hydroxyd reactor support?

Hello,
I have a question: I want to check if KH director can be used in a mecanism which is inverse of Calcium reactor:
I'm distributing Calcium hydroxyd for raising Ca and Kh.
Can this be conditionned by KH director?
The distribution engine is a dosing pump injecting RO water in the reactor.
So the only question is can calcium reactor manage something raising Ph and not decreasing it like it's the case for the Calcium reactor mode?
In your example for a calcium reactor:
Initial target value: PH 6.5
KH actual value Calculated pH setpoint change
6,5° dKH -1,5 = pH 5,0
7,0° dKH -0,75 = pH 5,75
7,5° dKH 0 = pH 6,5 – no change, KH value fits
8,0° dKH +0,75 = pH 7,25
8,5° dKH +1,5 = pH 8,0

In my case, I would like something like:
Initial target value: PH 8.4 (it's the Ph target in the tank)
KH actual value Calculated pH setpoint change
6,5° dKH +0,1 = pH 8,5
7,0° dKH +0,05 = pH 8,45
7,5° dKH 0 = pH 8,4 – no change, KH value fits
8,0° dKH -0,05 = pH 8,35
8,5° dKH -0,1 = pH 8,3


Is this possible?
Or if not can it be added?
Thanks
Houman