I wouldn't recommend anyone getting their dogs vaccinated using a homeopathic vaccine.
Whether they work or not, the fact is that there is absolutely no regulation for homeopathic medicines. Conventional drugs are all tested and licensed, and have schemes set up to monitor adverse reactions and cases in which the drugs do not work, and all such drugs are controlled by the Veterinary Medicines Directive.
Homeopathic medicines are not controlled in this way, so there is no way to determine whether they are safe and absolutely no reporting or recording of instances where they have caused an adverse reaction.
Regulation and safety aside, there is absolutely no proof that they work, and I know of many cases in which dogs vaccinated against parvovirus, using a homeopathic vaccine, died several months later with parvovirus infection.
In addition, homeopathy qualifications are not recognised by the organisation controlling UK vets (the RCVS) and as such anyone who feels like it can give these medicines, without having to know anything about them.