My goal is to raise the cost of tyranny signifantly without pricing myself out of the usage/maintenance cost.

The model I layed forward would sufficiently defend you from IRL cohersion, but not from the security state.

If you are really trying to hide from the security state, God help you. cc @Snowden . 

 Understood, not knocking the strategy, just asking to understand tradeoffs 

 It's a good question, and I should have clarified. This setup makes in-person surveillance prohibitively expensive without sacrificing too much usability, allowing the device to be used as a daily driver.