There are many other smaller Patek Gondolos, ref. 5024, 5112, 5010 for example. If you want some really cool and unusually shaped Pateks, do a search for Patek Gilbert Albert. Member Roni M on this forum has an outstanding collection of Gilbert Albert watches.
But at that price point you may as well get the OEM Patek rubber strap, unless you want something else than black. What they should have done to differentiate their strap, was to have some kind of quick release system so it would be easy to switch between different colored straps. Changing straps on
One thing that has changed over the years is the moon phase indicator. Early watches had a very reflective moon disc, which made it hard to see when viewing from certain angles. On newer watches the moon disc is less reflective and has some grainy texture. I'll see if I can find some pictures tomorr