How must be the pull up resistor circuit connected to the driver input?
As I can understand, the goal is to "inverse" an external switch behaviors by own circuit. In THIS case:

Quite enough to debounce input switch using a shunt-to-ground capacitor. There is no significant reasons to place buffer here. Usage of Schmitt trigger, surely is a "best practice", but often is not applicable due to unacceptable complication of circuit.