As far as I am aware the only way you could do that, would be to write a RESTlet that you could call externally. Are these all scheduled scripts, or also Map/Reduce? Are you specifically needing to run the scripts externally, via an external call?
If you do not need to run them externally, the best way would be to simply unschedule the deployment (or just make a duplicate deployment - depending on whether the deployment ID is hardcoded in a call in the script), and save and execute that deployment. That will trigger the script to act as though it was time for it to run.
If you need to call it externally, I'd just write a simple GET RESTlet that calls the scheduled script. You can find information about that here at these two links.
*Make sure you are logged into NetSuite before trying to click the links
SuiteScript 2.0 RESTlet Script Type
task.ScheduledScriptTask
Hope that helps out.