No I wouldn't. Not even as a favor.
500usd probably wont even pay your electric bill for this project. Not to mention wear and tear on your HDW. This job would probably cost YOU more than 500usd in the end, NOT counting your loss of time.
For what they want even a low budget film should be considering 50,000usd for the job. (total budget of 1m or so)
There are too many red flags telling me nothing will come of the project. It reads to much like some guy with a great idea and a gullible rich uncle.