I had mine stolen and returned, a few years back
iirc the pins securing the ignition switch are designed to be tightened, not loosened, so that thieves can't remove it.
You might get them undone, they have thread lock on them aswell. But otherwise the only way is to drill the heads off. To do that you'll have to take the top yoke off.
You can either buy the security bolts from Suzuki, or use standard pins.
tbh, the security bolts are a waste of time, when most thieves simply break the steering lock with a good boot