If you can get a picture of the back side of the watch band, you can inspect the stitching. On some bands that are box stitched, you can see where the lug end leather that makes up the curve tucks under the back lining leather. (Think about that for just a second, I hope my description made sense). On those straps, you can use a razor blade or exacto to cut through just the very top part of the stitching to free the lug end. Thread it through your fixed lugs and then glue the ends back down using heavy duty contact cement or leather glue.
If you're willing to mess with all that, it will expand your options in a big way.
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