From what I've seen, there is no risk in being vaccinated when you already have prior infection, and there are benefits to doing so. So I don't see why prior infection would constitute a good medical reason to avoid vaccination.

(Aside: it is worth noting that vaccination also induces "natural immunity", as it introduces viral units [via various mechanisms depending on specific vaccine type] that cause the immune system to work more or less the same way as it would if presented with a regular viral infection. So using the term "natural immunity" when what you really mean is "prior infection" smacks quite heavily of chemophobia.)