More to the point curved end bracelets, I have just realised watch bracelet manufacturers who sell curved end bracelets do it wrong. I could own a 36mm watch and you may own a 50mm watch. Though both are circular and wear a 20mm strap. The curved end might not fit.
A possible solid would be the watch company’s include/offer curved end links for their products.
Bracelets are sold by lug width, not lug-to-lug length. The length of the watch is irrelevant. Bracelets with curved end links are generally listed as fitting a particular watch. Watch brands can’t practically manufacture and sell end links that fit every aftermarket bracelet. Let the aftermarket companies sort that out.