BOSS displacement maps into Renderman


Hi All

I am trying to get a good Ocean setup working in renderman.
aaOcean is awesome but I can’t find out how to add a boat wake to this so I am trying to combine the wake from BOSS to an aaOcean sea.
This all seems pretty straight forward as BOSS caches out displacement maps into the cache folder, I have seen in a tutorial how you can plug these maps into a displacement shader in Arnold, however I can’t get this going in Renderman. Does anybody know how to do this? They seem to be vector maps but Renderman does not like them at all

here is an example .exr frame

thanks in advance