I just ordered one from jean Rousseau. Basically the snoopy strap for 260 shipped. Customized to my wrist for deployment.
Confirmed yesterday, waiting a few (5) weeks to receive!
Great quality, pricey but in line with most custom strap makers.
If anyone can advise, looking for a rubber / alligator strap for my PO 43.5, (21mm) there is one they did for the GMT and this would be the exact one I'm looking for... or something very similar. I've looked ebay and yes they have similar but they look worryingly cheap.