I’ve watched the videos on the security of the Diebold voting machines, I’m even less confident of an entirely online primary system. There’s no paper trail and the results could entirely be hacked by the same smoke filled back room people that you are saying are manipulating the system now.
I would be more inclined to trust a handful of known Republican staff computer administrators who all have background checks, social security numbers, names and reputations. The current nominees are picked, vetted and financed by nameless faceless heads of media and industry. The current tabulation process is spread out over thousands of nameless faceless individuals who have the capability to compromise the system at any point.