There is another way, if you happen to have another 3 phase motor laying around that is the same size or slightly bigger. You wire both motors together and use a rope wrapped around the armature to get the idler 3 phase motor started, and once it is running you can start and stop the saw motor at will.
I told an electrician at a manufacturing facility that I worked at, and he argued that it wouldn't work. He went back to electrical shop and wired up what I told him would work, and while it worked just fine, he said it didn't make sense, that it shouldn't work, but yet it did!
He told me later, that he was running a machine at home like this till he came across enough money to buy a VFD, or the company pulled one out of service that was still good. (VFD's used to be expensive!!)
If you want to wire up an idler motor to run it, let me know and I will walk you thru it.
David from jax