Keep in mind, while I know what I'm doing, I've never physically examined the exact bracelet you have in front of you. So what I am about to propose could quite easily not work at all due to some aspect of the bracelet and clasp that I cannot see from the photo, nor confirm the physical interaction between the parts. That said, is it possible to remove the small linkage on the 12 side of the clasp, to which the links attach? I am supposing that it is held to the clasp with a spring bar, and to the bracelet links with another spring bar. If these are not spring bars of the same thickness, then I'd stop there- it likely will not work. But if they are the same thickness, do you have two mating ends after you remove this part? Removing this linkage might give you enough of an offset between link sizes that a better fit could be obtained. It looks like the male end of the bracelet links could fit into the female end of the clasp after you remove that extra linkage, but it is quite possible that said linkage is necessary to allow clearance or rotational freedom of the links where they meet the clasp. In which case removing the linkage would be detrimental to the condition of the bracelet long-term. The linkage I am referring to is high-lighted in yellow below: