Any ideas of how to add a Save as Draft option?

I need to be able to give the user the option of saving their submission as a draft if they aren't ready to submit for approval. I know Meta Box doesn't have a way to do this natively, so I need a workaround. Any thoughts on how to accomplish this? A button next to the submit button that says "Save as Draft", but as far as I can tell, there's no way to do that.

Right now, I'm thinking of adding a switch field that says "Save as Draft" and then if selected, use the rwmb_after_save_post action to change the status to draft if the submission hasn't already been published.

Any other ideas that might work or look better?

Thanks