I have not tried the Vaz Mod plugin, but maybe I can help.
Since you are trying to create parameter objects manually, I assume that importing the Vaz did not automatically create a bunch of VST parameters? Maybe it’s because the Vaz does not support this, and relies on MIDI control.
Importing the plugin should at least have created the Pitch bend, modulation and channel pressure MIDI parameters (unless the plugin claims it is not a synth). If you have linked CC#70 inside Vaz, you should create a corresponding MIDI parameter in Podium. Don’t select the ‘plugin parameter’ type in the parameters dialog, but rather ‘control change’ and then enter the control change number. Look at the ‘Modulation’ parameter for clues.