So really, what you want, is a convenient & easy but totally secure method. Because if you want security, a one-time pad is pretty much your best option. But

So really, what you want, is a convenient & easy but totally secure method. Because if you want security, a one-time pad is pretty much your best option. But at the same time, since you pretty obviously are willing to go great lengths for security, let's not beat around the bush. Granted this has some of the same problems (need randomness), and can probably be more work than it's worth...