Phase mod is nothing like wavetable synthesis, I'm afraid.
You can automate the waveforms on the heisenberg, but as it's not smooth transitions between these waveforms it's not what you're after.
You can get much smoother transitions between the basic waveforms that the pulv provides.
You can also use the space to transition between the number of harmonics in the waveform and after setting up A and B oscillators as having different waveforms, you could transition between them..but again, it's not exactly what you're after there either. It's more of a crossfade than a true interpolation of the waveforms.
If at had macros your problem would be solved in an instant