miller handle keyable?

A quick learner from Vancouver, Canada says:
Your 82-076 patio door handle set is exactly what I need, except my handle set has a key lock. You don't show the exterior. Is it keyable? Can a key cylinder be added?
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Dave Sr. from SWISCO responded:
I don't believe this old style miller patio door handle comes with a key. This style lock is no longer used on modern patio doors, so it may not be possible to acquire. Is it possible to reuse your existing keyed outside handle?
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