You say this: “My trouble with voting and/or supporting political candidates—or participating in any “political” process, for that matter—is that while doing so may not be immoral per se, or even imply consent, can it not be reasonably argued that it does indeed help perpetuate the system.”
I regard this as a utilitarian argument, something libertarians reject, in favor of deontology. As far as the latter is concerned, voting is not a per se rights violation. Period.
Here is a bibliography on voting and libertarianism which gives both sides:
Pro: Block, 2012; Block and Fryzek, 2015; Rothbard, 1972A, 1972B; con: McElroy, 2013; Watner, 2000
Block, Walter and Nathan Fryzek. 2015. “Was It Immoral to Vote for Ron Paul? And other libertarian questions and answers.” November 26; http://www.targetliberty.com/2015/11/was-it-immoral-to-vote-for-ron-paul.html?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+TargetLiberty+%28Target+Liberty%29
Rothbard, Murray N. 1972A. “Should Libertarians Vote?” Outlook, April, p. 6.
Rothbard, Murray N. 1972B. “Interview.” February 25;
McElroy, Wendy. 2013. “The Faux Slavery Analogy to Voting.” July 31;
criticizes Walter E. Block
Watner, Carl. 2000. “Is Voting an Act of Violence?” April, The Voluntaryist. No. 103
Vegetarian, anti https://www.youtube.com/watch?v=63NNuG-6-hQBest regards,