...the interesting aspect of Hydroxychloroquine (besides easy to produce and as a generic...readily available) is that Africa has the lowest incidence of COVID-19...where almost everyone there (when and where available) have taken Hydroxychloroquine to fight off Malaria.
Hydrochloriquine is a therapeutic drug aimed at symptoms. Brilicidin is actually being tested for both vaccine capability and therapeutic. I know nothing about the vaccine potential but think the therapeutic angle has a good chance at success.