I could do that. I'll have to stop receiving payments at, say $17K, so the invoices will have to be controlled. I think the way you have been doing it is fine, where the bot gives a payment address if you should pay and says "wait for further instructions" if it's not time for you to pay yet.
We can discuss the details, like where to wire the total and invoicing details, in PM or via email. How much of the total has already been collected and is ready to go to SP toward the 50%, if they'll agree to that?