wait about 24-48 hours and if you don't get a response, just go aheaad and post it I'd say...
I would rather suggest him to wait for a response. If he is really willing to do something for his native speakers, he should not spoil it by breaking a rule and getting a negative impact for that. Patience mostly works better than doing things in hurry.
I don't think you're likely to get banned for one rule break...
Would you say the same thing to someone who plagiarizes or breaks another forum rule? Rules are rules, and there can be no partiality for it, no matter who is the person in question. Someone should either follow the rules, or get ready for the punishment. So I would suggest mday to be patient in this matter to avoid getting into negative sides of the matter.