SSS100, if only it were that simple!

Trevor, the reason I asked about the accounting officer is because in my experience one sometimes meets much resistance and you are then forced to accede to the client's wishes, let the predicted consequences come to pass, try not to gloat when they do, pick up the pieces and repair what you can. The alternative often is to lose the assignment.

You clearly know what you are doing, so I'd say trust you instincts.