I would speak to the boutique, and ask if they have a watchmaker on staff. If they do, ask them to order a replacement, and when it comes in, have their watchmaker do the swap, and they can send the old case back to Omega for credit. The swap itself would take all of 5 minutes (including a pressure test after).
If they don't have a watchmaker, or won't do the above, I would just wait until it's serviced, and have that swap done then.