What purposee would this "evening out" serve?
It would serve the purpose of giving the meter a spectral response at least approximately the same as the film I am shooting.

You are close to Extended Red IR film.... "Evening out" would only be useful if you are to use conventional black and white, or color film.
I don't care about IR film. I have never stated that I intend this meter to work for IR film. I don't shoot IR film or plan to in the future. I shoot TriX and Neopan 400.