The Clyde engine would not extend the Wyvern's career

Would the Rolls-Royce Clyde engine have changed how long the Westland Wyvern remained in service?

Not if it were made as reliable as the Python; with its historical vibration problems, it might have shortened the aircraft's career.

Two different counterfactuals lead to different results. If the Rolls-Royce Clyde worked as reliably as the Armstrong Siddeley Python, changing engines would probably leave the Wyvern's service life much the same. If the Clyde retained its severe vibration problems, forcing it into the aircraft could reduce reliability and shorten the type's useful career. The Python was selected because it worked, so an alternative engine must first solve the defect that historically disqualified it.