Never thought of making one out of wood, in my head I'm thinking the keyway wouldn't last but it's not an option as the lathe is currently out of action anyway.
The foreman at the machine shop said it shouldn't be a problem for them to do it, the keyway is a bit of a....insert expletive of your choice here...but otherwise shouldn't be a problem. So hopefully I'll get that back next week and be up and running.