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I get your point. But unfortunately, the computer cafe owners definitely wouldn't allow you to do this. They record and charge their customers by the minute through software that's installed on the client computers for this exact purpose; and the computer would automatically lock if the user runs out of credit. Booting into the USB means that that software obviously wouldn't be able to run.
True, but it might be allowed if you borrow friends PC or use public PC.
Tor is going to help you with privacy, but not really in terms of account security. Even if you use Tor on a device that's not yours, you're still screwed regardless if the device has a keylogger anyway.
And that's why i suggest install linux on-the-go on flashdrive