Sorry to hear about your watch. I'm no fan of Bremont but I suspect that they are not alone in restricting warranty work when it comes to strap or bracelet failures, even if they made the design decision to use an unorthodox system such as hex bolts.
Given the age and likely cost of the watch, an appeal to their better nature may be your best hope. There are certainly members here with contacts in Bremont, who I hope can assist.
Best of luck.