Send it to Swiss Time Services in Essex, they are an authorised repairer with a parts account. Assuming the chrono bezel is a similar price to the 3 hander version (it is a different part though) then you can get it swapped for around £250 all in, of which ~£50 is the part repair fee and £10 is the return postage. The part is actually around £190 and it would have been best to have it swapped during the service but it sounds like whoever forwarded it didn't give you that option, meaning you are now having to pay twice for the labour.
ps Simon Freese is no longer with STS and has set up as an independent, he may be worth trying but may have trouble sourcing you a new bezel.
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