That said, why not set MDA in the alerter on a CANPA? You add 50' to the MDA for a pseudo DA, right? (surely you don't use MDA as a DA with the inevitable descent below?)
First of all, there is no need to add 50 ft to MDA, at least our Feds did away with that years ago, and I much prefer the Airbus method of setting MDA in the box, and setting missed approach altitude in the alt alert window, much more sensible, we call 100 above and minimums where the response is missed approach or landing, no need to fiddle around withe the altitude alert after passing the IAF,