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That depends on when you want the cores disabled. The OS can't turn them off until the OS is booted.

So disable them via BIOS or crack open the case and physically remove them if you don't want...

Well you know about the 'psradm' command so you could put that into a script file, for example,

/etc/rc2.d/S??disable_cores

so that it gets executed on every boot up so you don't need to...

It won't. You should actually run
taskset 1 myproc
to bind your process to core #0.
You can still use pbind. Just wrap your command with a script that bind itself to the required core then...