SBG, I would have thought that it is no different to Ribes laurifolium, but perhaps planting with Rootgrow might give some protection as it does when planting on contaminated land.

it is a R laurifolium so you suspect no different to R sanguineum. rootgrow doesn't protect against HF according to an rhs advisory panel member I asked years ago. Thanks for your response jummy :o)

According to Burncoose Nurseries they list it as one of the problems this particular plant may be susceptible to.
The RHS have a list of plants and their level of susceptibility to honey fungus. They mention Ribes (variety not specified) as susceptible but further down they list plants with a decreasing or no risk. Would it work to site near those types of non susceptible plants already in your garden.
https://www.rhs.org.uk/advice/pdfs/honey-fungus-host-list.pdf