Saal Digital accepts sRGB (all products) or AdobeRGB (for most products) only. I have used their Fuji color profile for softproofing, and it works fairly well. You can refer to How to manage images for web and print efficiently? for a discussion - I stopped trying to convince Aurelien about the usefulness of softproofing and the profiles which I used (Saal Digital’s profiles for large calendar prints), which doesn’t mean I’m not convinced about what I wrote. So I do soft-proofing with the printer profile, but gamut checking with the output profile - only checking for color issues visually. But then I rarely have such difficult subjects as the kingfisher, color-wise.