Am I able to integrate another push to talk program such as Ventrilo?
There is no easy way to integrate with Ventrilo. But of course you can use Zello PC client instead. Or maybe use a PC with two sound cards and run Zello and Vent clients side by side each using its own sound card and sending audio output from one to input of another. In Zello you'd want radio gateway mode to accomplish that. Not sure what is possible with Ventrilo.