CPM Modulator Implementation Methods

In the comm.CPMModulator help, in the "More About > CPM Method", it says the output comes from a relation mentioned there.

But, the only way to get to the same output is by using FM Modulator method (using g(t) instead of q(t)).

I wonder if there is a way to get to the same output just by using that relation (using q(t)).

Thanks!