Hi,
My Pekins will sometimes scratch or scuff their beaks on who knows what in the yard or in their pen. It is always a bit red where the scrape is but doesn't appear to ever bleed freely. In the past, I have wet a sponge with water and applied just a dab of antibacterial soap and then blotted the scrape. Just make sure you rinse any soap off.
I've been through all kinds of boo boos when I first got my ducks as they are quite curious and people used to fish on our pond before we moved in. I've removed two fish hooks, one from the mouth and another from a leg and both ducks are fine. As a rule, I try to do what's practical and any cuts should be cleaned out similar to an animal or human.
I'm sorry I can't help you out finding a vet. I live in the US, but I know your frustration as it took me a long time to find one too and although I managed to locate one, he primarily deals with injuries and not necessarily illness.
Good luck with your duck.
Pam