You can borrow a spring compressor from most of the chain auto parts stores for free. That would be my first suggestion but since it's already been ruled out for some reason, as well as a torch and compressor, I'd lean towards a friction cutoff blade in a grinder/Metabo over a Sawzall. Spring steel is about as hard as your Sawzall blades, so have a pile of them because you're going to rub your way through it.
Not that it particularly matters, but did you lose a bet or something?
Tobin
KORE3