[noondip]

This is a cool idea! My contribution to anti-surveillance trolling is setting the subject of all encrypted mail to, "Your heroin order has shipped."

[zz1]

Which isn't bad: your method works against lexical analysis (which as Bill Binney said is terrible because it buries analysts under too much material), while this method is against the three hops policy.

Please, do not forget that encrypted e-mail should not be predictable: https://futureboy.us/pgp.html#GoodPractices