There s no problem having different domains pointing to the ip-address of your hfs-server.
What you ask for has nothing to do with hfs, you only need to register (payed or free) more domains. Dyndns free domains for example allow having different free domains, so with one update all is done. If you register your domains on different sites, perhaps you need to update each one, what will be no problem if you have a static ip. If you have dynamic ip, perhabs you need to have different updaters working.