In business, just like poker, it is important to be careful who you tip your hand to. A public proclamation of your opening comes with several undesirable side effects.
Set aside the cost and dubious effectiveness of filling critical positions through an in-house vehicle for now. An open position is sure to create anxiety and apprehension among current employees. Disappointment over not being considered for the job—or worry about new management and transitional problems—have a negative affect on morale.
Consider an even more serious issue. Alerting competitors to a weakness or void within your company is not a good idea anytime—especially when hoping to sharpen a competitive edge.