Update: Done. Here is what I did.
1. Installed gasket and exterior door handle and secured with masking tape on the outside.
2. Inserted handle retaining nut into socket on the end of a long ratchet extension and installed nut.
3. Used a long finger retriever (tool has a plunger and grabber fingers on the end) to fish the latch rod up to the handle location.
4. Held the rod close to the latch hole location by making a fork type hook from a welding rod and taping it to the door frame. Released the finger retriever.
5. Rolled the plastic retainer on the latch over the top and towards the door skin.
6. Pushed the latch rod down to get rod end and hole in latch lined up.
7. Inserted rod into hole in latch.
8. Used a welding rod hook to roll the plastic retainer back over the top and onto the latch rod.
9. Used a long handled screwdriver to gently push the plastic retainer onto the latch rod. Snap! I'm done.