I've had 2 curved-end straps for my JLCs done by
Hughes Handcrafted in Singapore,
pics here. From Germany, I've also done one from
Dangerous9 straps for my FPJ,
pics here. Both did excellent work; in fact I was in Hughes' workshop just yesterday making another strap.
I think Camille Fournet and ABP Paris will also do custom curved straps for you.
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