If your threat model allows you to do all these manipulations and send a note to your ally which will be received even though it is intercepted... I don't know what your threat model is.
Let me suggest something much simpler and harder: two code words which you arrange with your ally. One word means "I'm in trouble"; the other word means "Don't trust anything from me until you see me in person." The words should be common enough that you can work them into a phone conversation or an email, but not so common that you will use them by accident. An uncommon synonym for a common thing is plausible.
PNH@32: The Netgear WR-614 (http://www.newegg.com/Product/Product.aspx?Item=N82E16833122016)
works pretty well, and is reasonably cheap.
KristianB solved
the logic puzzle
that he found
in your blog.
You were probably expecting
people to take longer
and argue
the validity of syllogism
Please forgive him
he solved it
so quickly
and properly.
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