Don't even bother to try fire the thing up without rings,,,,if any combustible gasses get passed the piston into the sump, it may ignite the oil and you will have an exploded case to deal with,,,,that is,,,,if it will start without rings to begin with.
your just asking for trouble,,,,,,so if you want to test the clutch,,,you can get a big drill and suitable socket attatchment,, and spin the motor with the drill,,,,and engage the clutch that way.
If your bound and determined to try fire the thing up without rings,,,,,,have a fire extinguisher ready,,,,,and notify your next of kin.