[gpvos]

Getting caught in the air seems nigh impossible, since by using this trick you aren't giving them any way to identify you.

[bspammer]

They'd have your stunnel server IP, so if they were really, really determined they could probably track you down by forcing your ISP/VPS provider to identify you.

I doubt they'd bother for $45 worth of WiFi, but personally I would err on the side of caution.