So here's a completely tonally dissonant character that I think would work interestingly with Wesker - Reigen here is a homeopathic professional in the area and he does this in order to convince people that they need conventional/proper medical treatments. So considering they're both in the general field of "medicine", there's a couple possibilities - either they dislike each other because they're both quite shady businessmen, or they're working in tandem somehow (particularly if Wesker is the sort to get reeled in by Reigen's scheme, since Reigen is actually quite a bombastic and charismatic sort of guy)