I have a similar strap on a CW I've had for a while. My fitting is with what appears to be a threaded bar/screw. I can take it apart later if that's of interest.
Cheers. That's given me an idea of what I should be searching for and I reckon that these may do the job.
https://www.watchbattery.co.uk/shop/products/SB-STB.shtml
@aggi started
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I have a similar strap on a CW I've had for a while. My fitting is with what appears to be a threaded bar/screw. I can take it apart later if that's of interest.