I would take it to a transmission shop for an estimate. I would think they would check it out for free. I do know of a way to temporarily fix metal lines but it would be tough in this situation. That would be to clean it to bare metal and then tightly wind wire around the line starting and ending about a half an inch from the hole. Then you solder the entire winding. Believe it or not you can temporarily repair even hydraulic line this way. But for this trans line you'd probably have to remove the line first to get it clean enough. If you're already removing it then just replace it.
There's no 'I' in denial.