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Really Bad Idea IMHO
The sidewall, once punctured, is not repairable. You say you have a 3 inch gash. That is much different than a simple nail or screw hole.
The sidewall provides stability to the tire when you turn. (Watch some other car go around a turn and imagine the force being applied to the sidewall as the tire deforms in response to the cornering forces.)
No patch will hold, and the cords in the tire could pinch or puncture the tube.
I'd never do what you are suggesting, lest it all let go suddenly as you are driving and you lose stability, damage the rim, and who knows where the car and occupants are going to end up.
I think you are better/safer waiting for the tire, as unpleasant as that sounds.
Good luck.
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