That’s a wonderful idea.
I am a professional, full time writer.
I would use them, if they could provide a timely service.
The turn-around would have to be less than two hours.
I think it could be done.
Is there a group, maybe "Grammar anonymous" which could organize this?
There are many people obsessed with grammar and spelling. Why not be willing to participate in promoting better practice in grammar and spelling on the Internet?