Did you establish the cause of the water ingress? I can sort out the movement swap but if the crown seal or glass seal have failed that'll be more difficult. I know v. little about Hermes watches but I`m assuming they won't supply case specific parts. Usually the seal in a crown can be replaced and glass seals can be replaced using a readily available generic part, but it can get involved, glass seals in particular can be tricky to source and fit correctly.
PM me if you want to send it to me, I'm sure I can sort out the movement but the root cause of the leak really needs to be tackled too, that could prove harder.