A custom strap is always nice, especially when you get a custom hole punched into the strap specifically for your wrist.
At the risk of sounding un-original, but I hope to one-day get a midnight-blue strap from a certain strap-maker in Paris with three holes punched (different holes for different levels of physical activity and different seasons).
My semi-custom belt (for my pants) also has three holes.
The 1815 Chrono is indeed a beautiful watch with a unique personality. May you find a good strong strap so that way it stays strapped on your wrist for many years to come.