sliding door lock

Have pics of existing door handle with 4 15/16ths screw holes with fixed anti-lift arm and rotating latch key but I don't have key cylinder and want a lockable handle. Existing interior handle has slot for key cylinder arm and other than handle itself the locking hardware portion is the same as 82-005. My exterior pull appears to be identical to 82-402 with what looks to be a knock-out for key cylinder. Do I need just the key lock cylinder 82-310 or will I need the exterior pull 82-302 also? Existing wood sliding door is 1/2" thick. Also need 89-012 side mount keeper, since existing keeper is a mortised unit in previous door frame. Wooden sliding door now butts up to an aluminum frame doggy door 3/4" thick but both interior sides are flush to one another.
Thanks in advance for your advice! Rich

82-302 is definitely not an option. If it's worth $10 to avoid the hassle of punching or drilling out your existing handle buy the 82-306. I'd say if it looks at all difficult to you, the pre-made one is better.

Does the 82-005 come with the 89-012 Closed side mount?

Thank you

Tom