Yes, you do need to find a person who can understand your idea. But it doesn't start with a script. That's the final step.
It starts with your own ability to tell the story.
English skills have little to do with it. Videos don't resonate with people because of clever word usage. A successful video connects your solution to a common problem shared by many others. It doesn't even need a voice-over for that.
An engineering mindset has little to do with it. Apple doesn't explain how their iPhones work. It's unnecessary. All we need to know is why our lives will be better if we own Apple products.
The two obstacles you claim are actually your best opportunities. You'll have your story when banish your command of the English language as a barrier to tell it. You'll nail your story when you strip away the explanations hiding your benefit. How it works isn't important. Why it works is what matters.
All this takes is simple language and confidence. A script doesn't give you this. You give it to the script.