i think the service board is the easiest way or place someone can as we see it so easily and also come in contact with you, since the payment will be paid in bitcoin, so from my own point of views dropping it here will bring so many discussion, so as you said the thread is already in service board i think is more preferable and easy access to locate.
I think so too since the developer will be paid in btc but there are two payments which is in btc and in alt. Having two threads won't hurt since it is in different board like services and service discussion (altcoin) and then put the link of the thread to make it easier to redirect in both thread where the links are posted in each thread.