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As long as you can keep moving at a reasonable speed your radiator can be just about empty and you will not overheat the engine.
I smashed open my radiator whilst green laning and managed to ride home at low revs on open roads without any increase in normal working temperature. However, I managed to choose a route where I knew I would not be stopped for anything more than half a minute max.
I would not expect this to work well in stop start traffic. Sitching off the bike is only likley to further increase temperatures as water will not be moving.
I would highly reccomend for any long trip that you take a bottle of hyperweld or similar. I have permenatly repaired 1 radiator and 2 blowing head gaskets with this. Deatails under blown head gasket (ADD LINK)